Sources:

https://uk.usembassy.gov/role-political-parties/#:~:text=As%20the%20electorate%20expanded%2C%20the,to%20accomplish%20this%20essential%20task.

https://www.loc.gov/exhibits/creating-the-united-states/formation-of-political-parties.html

https://inthesetimes.com/article/politics-party-system-america-democrats-republicans

https://www.loc.gov/classroom-materials/elections/presidential-election-process/political-parties/