5.what problem did frederick jackson turner's frontier thesis
expose?

a. america's unique development could not continue in
the absence of a frontier.

b. intervention in international affairs would cause
domestic interests to suffer.

c. the u. s. navy needed to be modernized.

d. the purchase of alaska was a bad idea.

Which statement best describes a significant cause of world war ii? o a. the economic boom that followed world war i allowed countries to build up huge militaries. o b. the treaty of versailles, which ended world war i, left lasting resentments in many countries. o c. the rise of imperial states in asia caused european powers to unite for their common defense. o d. the league of nations encouraged european states to form secret military alliances.