Read brief descriptions of US political parties and how they formed in the online encyclopedia American Governance.
Schechter, Stephen, et al., editors. American Governance. Macmillan Reference USA, 2016. Gale eBooks, https://link-gale-com.chemeketa.idm.oclc.org/apps/pub/5WMM/GVRL?u=oregon_chemeke&sid=GVRL.
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A platform describes a political party's principles and goals. Platforms are presented at a political party's national convention.