AHC: Actually Isolationist USA

With a PoD anytime after the Civil War (1865) but before the Spanish-American War (1898), make the United States a truly isolationist state, or at least something close to it. That means no military action outside of North America or the Pacific west of Hawaii.

EDIT: Should probably mention that the US has to maintain the same system of government (federal presidential constitutional republic) and keep all the territory it had as of 1866.
 
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An extremely aggressive stance to the end of the Slave Trade makes it the social pariah of the rest of the world maybe?

Invasion of Canada that backfires worse that OTL 1812. The destruction of the US navy in said war and a post war that allows moral and religious elitists to seize power and declare the Kingdom of America.

Allow Spain a better showing in the Spanish Civil war, maybe taking Mexico or Gran Colombia back into the fold. Basically you need more European influence in the Americas and a general feeling that the US can only look after itself.
 
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