The post-world war i generation, but specifically a group of u. s. writers who came of age

What event brought the us into wwii? what conflicts happened after the us entered the war? i know the first part of this question, i need with the second part.

Which nation most to bail out greece’s failing economy?

Under president reagan, the united states began to develop the strategic defense initiative, nicknamed "star wars.” what was the goal of that plan?