Democracy. because they were mostly democratic
Since World War I was a "total" war, this meant that entire economies and industries of nations were mobilized to help the war effort--meaning that factory production turned towards things like making tanks and weapons, instead of "regular" items.
Its distance from the mainland of Korean and China.
President Roosevelt plans to alleviate if not to end American suffering in the Great Depression through the New Deal program is halted because it was declared as unconstitutional. In order to pass the Laws, he resorted to gaining favor in the Judicial branch by appointing justices. He pointed out that there was no provision in the Constitution (Constitutional provision) stating the number of justices on the court, thus packing the court is valid.
