Which politician proposed the idea of nullification?

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.

Although a number of things brought about world war one there was one even that push to europe over the edge. what was that event?

Why were colonial assemblies created and what did they do