How did roosevelt corollary benefit the united states

What effect did john hay’s open door policy letters have on the imperial powers of britain, france, germany, russia, and japan? a. it provoked the imperial powers to declare war on the united states. b. it caused the imperial powers to restrict trade in their trade with china. c. it warned the imperial powers that the united states would soon declare war on china. d. it signaled to those powers that the united states would take a larger role in world affairs than before.

What was the most important consequence of the large-scale ecological changes in africa two hundred thousand years ago?

Explain how colonists treated the native americans and what happened to natives. ! ^^^ 12 points