What are 3 possible effects of the United States no longer having a major competitor in the world?

Why is it useful for historians to base certain studies on the analysis of historical themes

What is the main purpose of "falling action" in a story?

Explain the reasons for u.s. neutrality during the 1920s and 1930s. how did ideas about neutrality change during the period from the end of world war i to the passage of the lend-lease act? be sure to include any events, terms, or people that may support your response.