Needed a strong central government
In 1823 U.S. President James Monroe proclaimed the U.S. protector of the Western Hemisphere by forbidding European powers from colonizing additional territories in the Americas. In return, Monroe committed to not interfere in the affairs, conflicts, and extant colonial enterprises of European states.
It led to drastic inflation of prices in the 1970's
the increases in prices led to an increased level of public anxiety. there was widespread discontent in the USA. The problem was made worse by increased oil prices resulting from wars in the middle east. It also sedimented American uproar against the Vietnam war.