A Marxist-Leninist ideologue who fled Chile for the USSR after the CIA backed coup. After starting a new life in Moscow he 'saw the light' and became a rabid anti communist, who fled to the US after the Cold War ended and became a staunch Republican.
This actually didn't happen that much. Even today Chileans that live permanently in Cuba vote overwhelmingly for the left.
Socially conservative copper miner who came to dislike the environmentalism of Democrats. who became rich working for a U.S. minning company and then moved to the U.S.
Fixed it.
How likely do you think it is that an Allende supporter might move to the U.S. in the 70s or 80s, become a smallholder/small business owner, and then have their politics warped into becoming a Republican because of wanting low taxes and less regulation?
He would move in the 90's -early '00s. Northern regions of Chile have been drifting away from the left because the miners became rich and the mining traditions are slowly dying off. Is not exactly unthinkable that a U.S. mining company offered a job in the U.S. or something like that and started voting for his economic interest.
I just take issue with the environmentalist angle. Copper mines (and mining in Chile in general) are not really threatened by environmental regulation, is just that corporations are extra greedy but they could make an obscene profit just fine without destroying glaciers or something. Environmentalism is widely supported in Chile, especially by those who live near industries and mines. Maybe later this hypothetic voter would have switched his view as the US political discourse became his new normal, but his initial switch would have been primarily caused by economics.