Why did so many Americans support isolationism?

Many Americans supported isolationism because the rise of dictatorships and militarism in Europe made their sacrifices during World War I seem pointless.

Aproverbs i hope this

Opposition to the nra came to a head in 1935, when the conservative supreme court declared the agency unconstitutional, claiming the nra gave the executive branch regulatory powers that belonged exclusively to congress. this decision began a series of court decisions that overturned key elements of the new deal.