Christopher Columbus is the explorer who is credited for discovering America. Of course, there were already people living in America at the time who we call Native Americans. There even was a European, Leif Ericsson, who had been to the Americas before. However, it was Columbus' voyage that started the exploration and colonization of the Americas.
Jazz, social justice were both big ones
Marquis de Lafayette helped to train the American colonists and even served in battle with them. Lafayette first came to the American colonies in 1777. Upon arrival, was appointed a Major General in the colonial army. From there, he taught the American colonists military techniques, strategies, and other important information needed to defeat the British. He even fought for the American colonists in the Battle of Brandywine. His help was imperative to the colonists success against the British.