The history of American political parties has generally been one of protracted periods of stability interspersed with swift shifts in partisanship. These settled times are frequently referred to as party eras.
Both the Democratic Party and the Republican Party have existed in the United States since the 1850s. One of these parties has won every presidential election since 1852 and has had congressional dominance since at least 1856.
During the conflict over adoption of the federal Constitution of 1787, political groups or parties first emerged. The conflict between them grew as focus switched from the formation of a new federal government to the issue of how strong that federal government would be.
To Know more about party eras.
https://brainly.com/question/25391282
#SPJ4