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This article traces the history of the Atlantic Ocean as a zone of human contact, exchange, and conflict - from early crossings and the emergence of sustained trade networks to the development of the Atlantic world as a conceptual and geopolitical unit. See atlantic for the main topic page and Atlantic Trade - History for the history of Atlantic commerce specifically. For the intellectual history of transatlantic political influence, see Declaration Transatlantic Influence - Shared Sources Viewpoint.

The Atlantic was not unknown to antiquity, though sustained oceanic navigation lay beyond the reach of most early civilizations. Phoenician sailors reached the Atlantic coast of Iberia by at least the ninth century BC, founding the settlement of Gadir (modern Cádiz) and trading along the Moroccan coast. Carthaginian admiral Hanno the Navigator led an expedition down the West African coast around 500 BC, recording peoples and places as far south as possibly modern Sierra Leone or Cameroon, depending on interpretation of his surviving account, the Periplus of Hanno.

Greek geographical thinking encompassed the Atlantic - called the Okeanos - as the outer sea surrounding the known world. Pytheas of Massalia sailed into the Atlantic around 325 BC, reaching Britain and possibly Iceland or Norway, which he described as Thule. Roman commerce extended to Britain and the western coast of Gaul, though the Romans made no sustained effort at deep Atlantic navigation.

Irish monks, notably Saint Brendan, undertook Atlantic voyages in the sixth and seventh centuries AD. The Navigatio Sancti Brendani, composed around the ninth century, describes a seven-year ocean journey and has been cited in discussions of pre-Columbian contact, though the text's relationship to actual voyages is disputed.

Norse expansion brought the first documented sustained European presence in the western Atlantic. Norwegian settlers reached Iceland around 874 AD and Greenland around 985 AD under Erik the Red. Around 1000 AD, Leif Eriksson sailed to a region he called Vinland, believed to correspond to the northeastern coast of North America. Archaeological excavation at L'Anse aux Meadows in Newfoundland, beginning in 1960, confirmed Norse habitation in North America, providing the only confirmed pre-Columbian European settlement site in the Americas.

Sustained European Atlantic navigation began under Portuguese sponsorship in the fifteenth century. Prince Henry of Portugal, known posthumously as “the Navigator,” organized and financed a program of systematic exploration along the African coast beginning in the 1420s. Portuguese navigators reached Madeira around 1419, the Azores around 1439, Cape Verde around 1456, and progressively extended contact down the West African coast, reaching the Gulf of Guinea by the 1470s.

The motivating interests were mixed: access to West African gold and other trade goods that previously moved through trans-Saharan Muslim intermediaries, the search for a sea route to Asian spice markets, and the desire to make contact with any Christian kingdoms that might lie beyond the Muslim world. Portuguese navigators developed new ship designs - particularly the caravel - and navigational techniques suited to open-ocean sailing, including use of astronomical observation and dead reckoning.

Bartolomeu Dias rounded the Cape of Good Hope in 1488, establishing the sea route to the Indian Ocean. Vasco da Gama completed the voyage to India in 1497-1499, reaching Calicut on the Malabar Coast.

Castilian sponsorship of Christopher Columbus produced the crossing that initiated sustained contact between Europe and the Americas. Columbus, a Genoese navigator, sailed west from the Canary Islands in August 1492 and made landfall in the Bahamas on October 12, 1492. He made three subsequent voyages between 1493 and 1504, establishing the Caribbean as a zone of Spanish activity. Columbus maintained until his death that the lands he reached were part of Asia.

The Treaty of Tordesillas (1494) between Spain and Portugal divided the Atlantic world along a meridian 370 leagues west of the Cape Verde Islands, assigning western territories to Spain and eastern territories - including what would become Brazil and the African and Asian sea routes - to Portugal. Pope Alexander VI provided the papal authority underwriting the agreement.

Amerigo Vespucci's voyages along the South American coast, between approximately 1499 and 1504, led to the recognition - first published in the Mundus Novus of 1503 and the Cosmographiae Introductio of 1507 - that the landmass was a previously unknown continent. The cartographer Martin Waldseemüller applied the name “America” to the continent on his 1507 world map.

Spanish conquest of the Caribbean islands during the first decade of the sixteenth century was followed by the conquest of the Aztec Empire in Mexico (1519-1521) under Hernán Cortés and the Inca Empire in Peru (1532-1535) under Francisco Pizarro. These events brought enormous territory and, critically, silver deposits - particularly at Potosí in modern Bolivia - under Spanish administration.

Portuguese colonization of Brazil began formally with the expedition of Pedro Álvares Cabral, which reached the Brazilian coast in 1500. Settlement proceeded slowly through the sixteenth century, organized around the export of brazilwood and, later, sugar cultivation.

The movement of biological species between the hemispheres - labeled the “Columbian Exchange” by historian Alfred W. Crosby in his 1972 study of that name - reshaped agriculture, diet, and demography on both sides of the Atlantic. Crops domesticated in the Americas, including maize, potatoes, tomatoes, and tobacco, entered European and African agriculture. Old World animals - horses, cattle, pigs, sheep - and crops such as wheat and sugarcane were introduced to the Americas. Old World diseases, including smallpox, measles, and influenza, spread through populations in the Americas that lacked prior exposure, causing catastrophic mortality among indigenous peoples.

French and English interest in the Atlantic developed in parallel with Iberian activity. John Cabot, sailing under English sponsorship, reached the North American coast in 1497. French fishermen worked the Grand Banks of Newfoundland from the early sixteenth century. Jacques Cartier made three voyages to the Gulf of St. Lawrence between 1534 and 1542, establishing French claims to the region.

Portuguese traders began transporting enslaved Africans to Iberia in the 1440s. The trade expanded as sugar cultivation spread to the Atlantic islands - Madeira, the Canaries, São Tomé - in the second half of the fifteenth century. The labor model of coerced African labor on plantation sugar cultivation, developed on these islands, was transplanted to the Americas after 1500.

The first enslaved Africans arrived in Hispaniola around 1501. By the mid-sixteenth century, enslaved labor was the dominant workforce on Brazilian sugar plantations. The Portuguese carried approximately 90 percent of enslaved Africans transported across the Atlantic in the sixteenth century.

The trade was embedded in existing African commercial and political structures. African rulers and merchants sold captives - generally war prisoners or people enslaved through judicial processes - to European traders at coastal forts and ports. The degree of African agency in and responsibility for the trade's expansion has been a subject of historical reassessment.

English, Dutch, and French powers contested Iberian dominance of Atlantic trade and territory from the second half of the sixteenth century. English privateers including John Hawkins and Francis Drake operated in the Caribbean and along Spanish shipping routes in the 1560s-1580s. The defeat of the Spanish Armada in 1588 reduced, though did not end, Spain's capacity to exclude rival powers from the Atlantic.

Dutch maritime expansion, enabled by the financial instruments and trading infrastructure of the Dutch Republic, produced the Dutch West India Company (chartered 1621) and Dutch East India Company (chartered 1602). The Dutch seized portions of northeastern Brazil from Portugal (1630-1654), controlled Manhattan and the Hudson Valley as New Netherland (1614-1664), and maintained Atlantic footholds at Curaçao, Suriname, and along the West African coast.

England established permanent colonies in Virginia (1607), Plymouth (1620), Massachusetts Bay (1630), and subsequently throughout the Caribbean and eastern seaboard of North America. France established colonies in Canada, the Caribbean, and Louisiana. These settlements created sustained demand for labor and goods that integrated into Atlantic commercial networks.

The mid-seventeenth century saw the formalization of mercantilist trade regulation. England's Navigation Acts (1651, 1660, 1663) required that colonial trade be conducted in English ships and channeled through English ports - a framework that shaped the structure of Atlantic commerce for more than a century.

The Atlantic economy of the eighteenth century was organized around interlocking flows of goods, capital, and coerced labor. Sugar, tobacco, rice, indigo, and eventually cotton moved from American plantations to European markets. Manufactured goods moved from Europe to Africa and the Americas. Enslaved Africans were transported across the Middle Passage to labor in American plantations. Historians have described these flows as the “triangular trade,” though actual trading circuits were considerably more complex and multidirectional.

The volume of the Atlantic slave trade reached its peak in the eighteenth century. Historian David Eltis and colleagues, using the Trans-Atlantic Slave Trade Database, have estimated that approximately 6.5 million enslaved Africans were transported between 1700 and 1800, out of a total of approximately 12.5 million transported between the sixteenth and nineteenth centuries. Mortality during the Middle Passage averaged roughly 15 percent over the trade's history, declining over time as voyage durations shortened.

British colonies in the Caribbean - Jamaica, Barbados, and the Leeward Islands - became enormously profitable sugar producers. Saint-Domingue (western Hispaniola, modern Haiti) became France's most valuable colony and one of the largest sugar and coffee producers in the world. These plantation economies depended entirely on imported enslaved labor, as mortality among enslaved populations exceeded birth rates in Caribbean conditions.

Atlantic commerce generated corresponding financial and commercial infrastructure in European port cities. London, Bristol, Liverpool, Nantes, Bordeaux, and Amsterdam developed banking, insurance, and mercantile institutions tied to Atlantic trade. Commodity prices in these markets were shaped by harvests and disruptions in the Americas.

The British colonies in North America developed distinct economic profiles by region. New England economies emphasized fishing, shipbuilding, and carrying trade. Mid-Atlantic colonies produced grain and other provisions. Southern colonies - Virginia, Maryland, the Carolinas, Georgia - developed plantation economies based on tobacco, rice, and indigo, worked by enslaved labor.

Atlantic intellectual exchange accompanied commercial exchange. The circulation of books, periodicals, and correspondence created transatlantic networks of educated readers. Ideas developed in European universities and salons circulated in colonial cities. Colonists contributed observation and natural history to European scientific institutions. The role of Atlantic intellectual networks in shaping the political thought of the American revolutionary generation is examined in Declaration Transatlantic Influence - Shared Sources Viewpoint.

The American Revolution (1775-1783) severed the thirteen colonies from the British Atlantic commercial system. The 1776 Declaration of Independence articulated principles - individual rights, consent of the governed, limited government - that circulated widely in the Atlantic world. French support for the American rebellion contributed to the fiscal crisis of the French monarchy.

The French Revolution (1789) and the Haitian Revolution (1791-1804) transformed the Atlantic political order. The slave revolt in Saint-Domingue, beginning in 1791, escalated into a sustained war involving enslaved people, free people of color, French colonial authorities, British and Spanish interventions, and eventually Napoleonic forces. The establishment of Haiti as an independent republic in 1804 created the first state in the Atlantic world governed by people who had been enslaved and the first post-colonial nation in Latin America.

British abolitionism produced the Slave Trade Act of 1807, which banned British participation in the Atlantic slave trade. The United States Congress passed legislation banning American participation in the trade in 1807, effective 1808. Other nations followed under British diplomatic and naval pressure over subsequent decades. The Royal Navy's West Africa Squadron, established in 1808, intercepted slave ships and liberated their human cargo. These measures reduced but did not immediately end the trade; significant numbers of enslaved Africans continued to be transported to Brazil and Cuba through the mid-nineteenth century.

Latin American independence movements between approximately 1810 and 1825 dissolved the Spanish empire on the American mainland, creating a series of new republics. Portuguese Brazil became independent in 1822. These political changes restructured Atlantic commercial relationships without immediately altering the plantation economies that anchored them.

British abolition of slavery in its colonies was effected by the Slavery Abolition Act of 1833, which provided for gradual emancipation and compensation to enslavers rather than to the enslaved. France abolished slavery in its colonies in 1848. Slavery persisted in Cuba until 1886 and in Brazil until 1888. The United States abolished slavery through the Thirteenth Amendment in 1865, following the Civil War.

Industrial production in Britain and later continental Europe transformed the commodity and goods flows of the Atlantic system. Manufactured textiles, machinery, and processed goods moved in larger volumes, while the Americas supplied raw materials - including cotton, which became the largest single commodity in Atlantic trade by the mid-nineteenth century, dependent on enslaved labor in the American South until 1865.

Transatlantic migration increased substantially across the nineteenth century. Famines, political disruption, and economic displacement drove large-scale emigration from Ireland, Germany, and eventually southern and eastern Europe to the United States, Canada, and South America. Approximately 55 million Europeans emigrated to the Americas between 1820 and 1930.

The laying of the first successful transatlantic telegraph cable in 1866 reduced communication time across the Atlantic from weeks to minutes, accelerating financial and commercial integration.

The Spanish-American War of 1898 transferred Cuba and Puerto Rico from Spanish to American influence and eliminated Spain as an Atlantic imperial power. The United States emerged as an Atlantic power of the first order during this period, asserting hemispheric influence through the Monroe Doctrine and its later elaborations.

The First World War (1914-1918) mobilized Atlantic resources and drew the United States into European military affairs after 1917. The Second World War (1939-1945) involved the Battle of the Atlantic - a sustained campaign between German submarine forces and Allied shipping - as a central theater of the conflict. American industrial and military capacity proved decisive in both wars.

The postwar North Atlantic Treaty Organization (NATO), established in 1949, institutionalized a transatlantic security alliance linking North American and Western European states. The Bretton Woods system (1944) established monetary institutions - the International Monetary Fund and World Bank - that organized international finance within a framework reflecting Atlantic power. The Marshall Plan (1948-1952) directed American capital to European reconstruction.

Decolonization dissolved the European empires in Africa and the Caribbean between the 1950s and 1970s, ending the formal colonial structures that had organized Atlantic relationships since the fifteenth century, though economic and political connections between former colonial powers and their former colonies persisted.

The degree to which African rulers' participation in the slave trade constitutes shared moral and political responsibility for the trade's scale and duration is a contested question; see atlantic-slave-trade-african-agency-controversy.

Whether the economic growth of early modern Britain and other European powers was primarily caused by, substantially caused by, or incidental to profits from the slave trade and plantation economies remains disputed among economic historians; see atlantic-slave-trade-british-industrialization-controversy.

The extent to which the Haitian Revolution directly influenced subsequent abolitionist movements and Latin American independence movements, as opposed to reinforcing European fears of slave rebellion, is a matter of ongoing historical debate; see haitian-revolution-atlantic-impact-controversy.

Whether the Atlantic world constitutes a coherent unit of historical analysis, or whether the concept obscures more than it reveals by excluding Pacific and Indian Ocean networks in which many of the same actors participated, is disputed among historians of early modern globalization; see atlantic-world-historiography-controversy.

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