Who referred to the domino theory as a reason to support liberation of communist countries?

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.

How long ago was the fall of rome (in years)

How did europeans and the introduction of european goods and ideas change native life ?