Since the ratification of the U.S. Constitution, the number of major parties that compete at any given time is Two parties.
Over the years and since the U.S. ratified the Constitution, a system has developed where only two major parties compete with each other at the same time.
This started with the Federalist Party and the Democratic-Republican Party competing, and currently, the two main parties as the Democratic and Republican Parties.
Find out more on the Republican Party at https://brainly.com/question/7096768.