Because of the needed help in bargaining for higher wages and better working conditions.
Since he lived in a theocratic government, he was tried by the Holy Office for teaching that the Earth revolves around the Sun which was deemed a heretic by the Catholic Church.
The Compromise of 1850 and the Kansas-Nebraska Act also worked to obtain similar results. When the newly founded Republican Party (the first real anti-slavery party) won its first election in 1860 with Abraham Lincoln, the South feared that the government would infringe on its rights and interests, which led to secession, and then the Civil War.
Lots of slaves rebelled against their french owners. They went on a rampage destroying towns. One slave took control of the government and restored the order.
The disaster<span> that Roosevelt believes will affect the United States is the aggression of the Axis Powers. He was aware of the fact that the Nazi Germany is rapidly expanding its territories by invading Poland in 1939. He predicted that the US will soon be affected on this spectacle.</span>