There were several political "leaders" who opposed US entry into World War One. The Progressive Party split, with Teddy Roosevelt leading those who favored entry into the war and western Progressives, LaFollette, Norris, Borah, and Johnson, fighting against a declaration of war. There were a group of politicians and citizens who believed we could ignore the military activities of Europe. They were known as "isolationists." An example was William Jennings Bryan. There were a very organised group of pacifists who opposed the war, led by Montana congresswoman Jeannette Rankin. She and over 50 of her colleagues in Congress voted against entering the war. Not all were pacifists, but many agreed with her that this conflict would resolve nothing, so they all voted against it.
Rankin According to the Congressional record. 6 voted against the war in the Senate and 50 voted against the war in the House. I will copy down the names of the senators and post them, for the Representatives I would recommend finding a local library that has the congressional records, state libraries or large law libraries should carry them back that far.
Germany, Japan, Italy for the most part
Neutrality and Isolationism were the American policies when World War I began. They kept the country out of the fighting, but it did not impede the sale of US goods to nations involved in the war.
{| |- | The primary opponents were the US and the Soviet Union. The US was supported by NATO while the Soviet Union had the Soviet Bloc. While they were opponents, they did not actually have a war going on that was hot, they weren't shooting at each other. There were numerous engagements with others that were bullets were flying. |}
After World War 2, the US had the strongest economy in the world.
Nations gave up the gold standard,this happend everywhere Under the Brettonwood treaty. (not sure of the spelling)
Germany, Japan, Italy for the most part
Herbert Hoover
Spain.
Spain and the US.
Spain
Spain.
isolationism and neutrality
Spain was the other belligerent.
USSR aka the sovet union
The US and the Soviet Union were opponents during the Cold War period of 1945-1990, because they had different ideologies and objectives for the world. The US wanted a world based on the free market, democracy, and independent nations, while the USSR was trying to bring about a world of a command economy, dictatorship, and control of all nations by the USSR.
Containment.
Generals Lee and Grant were each in the Mexican War as US officers. Later they both were in the US Civil War as opponents.