Where was u. s. citizenship first determined?

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.

President wilson’s moral diplomacy led him to support 1. revolutions in russia. 2. increased trade with china. 3. independence for the philippines. 4. taking over cuba.

What do you think was a drawback to this method of calculating distance