I'm not sure if these are exactly the answer but I hope it helps :)
President James Monroe proclaimed the U.S. protector of the Western Hemisphere by forbidding European powers from colonizing additional territories in the Americas.
The U.S. wouldn't interfere in European conflicts. The U.S. wouldn't interfere with existing European colonies or territories in the Western Hemisphere. European powers wouldn't attempt any further colonization in the Western Hemisphere.
It kept America safe, and neither of the countries really wanted to fight each other.