What problems could having six different Presidents in one year cause for 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.

Need will give brainliest which of the following was the most significant aspect of revel's election to the senate?

Between 1870 and 1916, approximately how many immigrants came to the united states? 10 million 25 million 75 million 125 million