What did the Monroe Doctrine do?

Answer 1

In the early 1900's, the Monroe Doctrine proved it's power. President Theodore Roosevelt aggressively enforced it during the Venezuela Border Dispute and in securing the independence of Cuba from abusive Spanish rule.

Answer 2

The Monroe Doctrine asserted that the Western Hemisphere was not to be further colonized by European countries and that the United States would neither interfere with existing

Answer 3

IT started the war against Mexico because Americe annexed Texas and that got the Mexicans mad.