The Couronian colonization of the Americas was performed by the Duchy of Courland, which was the second smallest state to colonize the Americas (after the Knights of Malta), with a colony on the island of Tobago from 1654 to 1659, and intermittently from 1660 to 1689.
Courland had a population of only 200,000, mostly of Latvian, German and Scandinavian ancestry, and was itself a vassal of the Polish-Lithuanian Commonwealth at that time. Under Duke Jacob Kettler (ruled 1642-1682), a Baltic German, it established one of the largest merchant fleets in Europe, with its main harbours in Windau (today's Ventspils), and Libau (today's Liepāja). During his travels to Western Europe, Duke Jacob became an eager proponent of mercantilism. Metalworking and shipbuilding became much more developed. Trading relations were established not only with nearby countries, but also with England, France, the Netherlands, Portugal and others.
The Duchy's ships started undertaking trade voyages to the West Indies at least as early as 1637, when a Couronian ship attempted to found a colony on Tobago with 212 settlers. An earlier European settlement on the island, a Dutch colony, formed in 1628, had been wiped out a few months earlier by Spain. The first Couronian colony met a similar end, whilst a second attempt was essentially blockaded by Spain and strangled in infancy by 1639. In 1642 two ships under Captain Caroon with about 300 settlers attempted to settle on the north coast near Courland Bay.
This colony was again blockaded, but proved more successful. Jesuit missionaries among the Carib quickly agitated and armed the tribes to attack the settlement, which was subsequently evacuated to Tortuga and later Jamaica. Under agreement with other Protestant powers who saw their various individual efforts insufficient to trade and/or colonize the Americas, Africa, and the Indies simultaneously, Courland's attention shifted to Africa. In 1651 the Duchy gained its first successful colony in Africa, on St. Andrews Island in the Gambia River and it established Fort Jacob there.