The CIA have been known to try to influence the elections in foreign countries. Declassified documents show they were doing it in the 1960s

https://en.wikipedia.org/wiki/Salvador_Allende#US_involvemen...

Obviously, things require a more subtle strategy these days.

Even before that (in 1953) they seem to have been directly responsible for the trouble they're now getting from Iran, by deposing a democratically elected government and installing a friendly puppet (to whom they supplied the nuclear technology that is now frowned upon) that quickly got overturned by the current regime: https://en.wikipedia.org/w/index.php?title=Operation_ajax

There’s actually quite the list here[1] but basically we’ve been very prolific at that:

> The U.S. has executed at least 81 overt and covert known interventions in foreign elections during the period 1946–2000

[1] https://en.m.wikipedia.org/wiki/United_States_involvement_in...