Don't be silly. Haiti won its independence in 1804... only 30 years after the USA. Since then it has been very isolated.
You're pulling this geocrap isolation out of thin air, because America was never considered purely an isolationist nation from 1776 to the present. American policies historically shifted from one to the other while wealth steadily increased. Isolationism therefore is clearly not a correlating variable to the generation of national wealth.
Most importantly, there exists zero evidence, (even if America was supposedly an isolationist nation) that it was the MAIN cause for America's dominating wealth status, especially when compared to other indigent nations that emerged in the Americas around the same time that were actually historically considered to be isolationists.
Points for attempting to appear clever though.