A guarantee against European intervention was stated in the: A.) Compromise of 1820
B.) Monroe Doctrine
C.) Compromise of 1850
D.) all of the above

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.

Which of the following farming methods the inca farm the hillsides a) slash- and- burn b) crop rotation c) irrigation canalsd) dam construction

When did paul zoll develop cardiac pacemaker