The United States annexed the independent state of Hawaii during the conflict.
They began to kidnap people from the west coast of Africa.The Spanish took the first African captives to the Americas from Europe as early as 1503, and by 1518 the first captives were shipped directly from Africa to America. The majority of African captives were exported from the coast of West Africa, some 3,000 miles between what is now Senegal and Angola, and mostly from the modern Benin, Nigeria and Cameroon.
President James Monroe wrote the Monroe doctrine because fear existed that the European powers might try to restore their postions in Latin America, which had in general already obtained their independence. The message that he was trying to get across : The United States were not to tolerate European Countries to make new colonies or interfere with the new independent countries; likewise, the United States would not get involved with conflicts between European Powers.