I don't know all of them but the battle of Lepanto took place in 1571.
Because they could be turned into slave states, giving more power to the slaveowners in the south. Also, expansion policy and the dram of Manifest Destiny played a part in desiring that land.
Martin Luther King as a preacher, pastor and civil rights leader during the Civil Rights movement in The United States during the sixties.
There are actually two reasons why Napoleon did so. One was because he knew that if he had held on to it, the United States would start a conflict, and he didn't want that to happen. Also, this is the most important reason, by him helping the United States, and him helping the French treasury at the same time, Napoleon was able to create a world with so much power, that he was able to challenge Britain.