The number one cause of the American Civil War is the issue of slavery.
Im pretty sure he was General George Washington
The U.S wanted to remain neutral, based on what Woodrow Wilson wanted, but after Germany started sinking U.S ships, they got included.
Thomas Paine's pamphlet Common Sense made the colonist realised that these rights were something that they wanted and it made them begin to stand up for themselves since they saw that they way they were being treated wrongly and that its a better way to live life.