看數據說話，不要憑感覺。

https://en.wikipedia.org/wiki/U.S._economic_performance_by_presidential_party

The following table compares selected results for the Democratic and Republican presidents, using the Blinder & Watson data (typically Truman's elected term through Obama's first term).

 

非農業就業，藍色是民主黨，紅色是共和黨