Which political system has a supreme leader?

List three reasons why explorers began to explore new, and old areas. [[ps: doesn't explicitly say where. i think it's more in general.

The middle east is the best association with which international traded product

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.