To add: I recently read a book about the the history of cocktails about how a few big European cities experienced a second cultural boom (after WW1) when the US

To add: I recently read a book about the the history of cocktails about how a few big European cities experienced a second cultural boom (after WW1) when the US started Prohibition in the 1930s. Most of the best bartenders moved to Paris/London/etc to open bars and ply their trade, which spread cocktail culture widely and created some legendary bars in Europe. A good example of how local political decisions can scare away talent and culture (with good intentions of course).