Book excerpt: New Sweden was a Swedish colony along the lower reaches of the Delaware River in America from 1638 to 1655, established during the Thirty Years' War when Sweden was a great military power. New Sweden formed part of the Swedish efforts to colonize the Americas. Settlements were established on both sides of the Delaware Valley in the region of Delaware, New Jersey, Maryland, and Pennsylvania, often in places where Swedish traders had been visiting since about 1610.