The answer is the Monroe Doctrine. This Doctrine was stated by the fifth President of the United States, James Monroe, on December 2, 1823, and became the foreign policy of the nation for many years.
The doctrine stated that:
●<em> The efforts of European nations to colonize land in North or South America, are considered as acts of aggression, requiring U.S. intervention</em>.
●<em> Any interference by European nations with states of North or South America would also be perceived as acts of aggression and would call for U.S. intervention</em>.
● <em>The United States would not interfere with existing European colonies</em>.
● <em>The United States would not get involved with the internal affairs of European nations</em>.
To declare boundaries between the thirteen colonies and the Appalachian Mountains, so American colonists couldn’t create tension with the French and Native Americans who live across the mountains.
The Texas Oil Boom! This was a period of dramatic change and economic growth in the US State of Texas during the early 20th century.
