The Louisiana Purchase made the United States twice the size it was before the purchase. They had to decide whether or not the states would be free or slave states, resulting in sectionalism.
Both were suppressed and held in camps
He invented dynamite.
He gave all his money to the Swedish Institute for the Nobel prize because he was accused of gaining wealth from selling weapons to warlords so he wanted to show that he is not corrupt and that he wants to help people instead of allowing them to wage war more easily.
I believe the number is 29.