C. France was far stronger than Spain at the beginning of the 19th century
Spain sold New Orleans to France because they needed money. Now that France owned New Orleans, they posed more of a threat to the United States because they were a strong world power at the time because French dictator Napoleon Bonaparte was taking over most of Europe so Jefferson was worried that Napoleon might try to take over the United States.
Rene Descartes was a key figure in the scientific revolution and had some stuff to do with math so probably him ( don't hold me to that and check other peoples answers)
It in America. America did not want to be involved in any of the world wars and joined because of the pearl harbor bombing.
There was an increase of anti-American sentiments in both areas. <span />