Could Hitler have done the same if he lived in the US?

Most probably. Necessary ingredients (to be present simultaneously): - lost war - huge debts - impoverized population - politically fractioned mainstream - huge inflation - financial/economical crisis - bust banks - unsuccessful democratisation now add one cunning and talented populist orator and watch ensuing mess. N.B.: answer hinges on definition of 'same' in the question. Same what? War? Holocaust? Ideological and institutionlized racism? Dreams of world domination? Answer: definetly some, probably not all of the above.