In the first years after the Articles of Confederation, President George Washington set a foreign neutrality policy. This policy was tested by many of the big nations; all had failed miserably. None of these attempts to undermine the neutrality policy tested President Washington’s patience like the French Revolution.
“In April 1793, Washington and the cabinet also crafted a series of rules of neutrality, which prohibited the arming of privateers and naval ships of belligerent nations and permitted the commerce of private vessels not intended for warfare.” (1)
This policy of neutrality was prominent and strong standing until the Civil War, and a brief period of time until the beginning of the Cold War/The War against Communism.
The last instance of America’s neutrality was in World War 2 when we joined the war after the Japanese attacked Pearl Harbor; we did not declare war on anyone up until that point.
Adding this policy as a constitutional amendment would prevent any sort of American Occupation in any country of any sort, be it soldiers, american guns, or even something as small as ammunition. It would restrict the U.S. Government from putting American lives on the line for an unjust cause; this could be any cause. It would also hold more taxpayer dollars for a better use inside our own country.
(1) - Miller Center - George Washington: Foreign Affairs