U.S. economic performance under Democratic and Republican presidents
Journalist David Leonhardt wrote in the New York Times that economists he interviewed were unsure about the causes of the better economic performance under Democratic US Presidents. However, one proposed cause was that Democratic US Presidents were, on average, more pragmatic than Republican US Presidents were. Random good luck and the condition of the US economy at the start of US Presidents' terms have also been suggested as possible causes of this due to the fact that it's easier for an economy to grow rapidly and create a lot of jobs right after a recession as opposed to after a very long period of economic growth and strong job creation.