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alternatehistory.com
Recently declassified files from 1975 show that USA had a plan to invade Portugal if the Carnation Revolution turned Communist or pro-soviet.
In our TL, the election of PS in 1976 and the first reforms to democracy inviabilized the american plan but WI the revolution did turn Communist.
The challenge is:
Make the revolution turn left
Make USA invade
Bonus if there is a civil war bettween communist and pro-ocidentals and independent isles (madeira and Azores) and perhaps even a new monarchy (monarchy was and is supported by many in Portugal but kinda UK monarchy)