That one time continued into my lifetime. San Francisco was Republican, with a long unbroken string of Republican mayors up into the early 1960s. Then liberal ah*les flooded in from the east coast, along with hippies from the midwest and ruined everything. I remember when USA flags were everywhere and the military was respected in SF, early 1960s. Both displaced by liberals who came later.
They don't call it the land of fruits-n-nuts for nothing, eh? And last I saw, the Southeastern states were fairly well represented with mostly conservative values.
Mebbe you were referring to the New England part of the East Coast.