Though the United States has almost always functioned under a two-party system, the two parties which comprise this system have not always been the same.
Can you name all American political parties which have been represented by a sitting U.S. president?
Some dates are rough and represent de facto political affiliations
The party modernly referred to as the ‘Democratic-Republican’ was historically known as the ‘Republican’ party. ‘Republican’ is an acceptable answer for both the historic and modern parties.