看数据说话，不要凭感觉。

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).

 

非农业就业，蓝色是民主党，红色是共和党