You seem to be confused on how this came about.
The elections put in a sweeping majority in the Venezuelan National Assembly. Maduro unconstitutionally created a new National Constituent Assembly. Then the unconstitutional Pro-Maduro NCA, stripped power from the constitutional opposition National Assembly.
This is about as clear of an example of a total dictatorship, as one could possibly imagine. The will of the people has been completely overthrown.
The opposition National Assembly that was elected by the people, then declared, in accordance with their constitution, that Maduro was a usurper. It was the National Assembly, elected by the people, that declared Guaidó the intern president.
Where do you see the US in any of that? You don't. There is no information or evidence, suggesting that the US was involved in any of this.