Why didn't america join the european war before 1941

Who were the main leaders of the major powers (france, england, and great britain) during the treaty of versailles?

Which instance of political expression would be considered symbolic speech? a. a student wearing all black to call attention to political issues b. a candidate for congress giving an interview to the media c. a demonstrator chanting anticorporate slogans outside a company’s headquarters d. a local citizen speaking up at a town hall meeting

What is human effort in human effort economics