Final answer:
Andrew Jackson ended the practice of congressional caucuses nominating presidential candidates. He won the popular vote in the contentious election of 1824 but did not win the presidency. George Washington warned against political parties, and in 1796, John Adams became president with Thomas Jefferson as his vice president.
Step-by-step explanation:
Andrew Jackson is credited with ending the practice of the congressional caucuses nominating presidential candidates. This change happened as a result of the contentious election of 1824, during which Jackson won the popular vote but lost the presidency to John Quincy Adams. The frustration his supporters felt from this led to the rise of a more formalized party system and the eventual adoption of national conventions for nominating presidential candidates.
When talking about warnings against the rise of political parties, it was George Washington who famously warned the nation about the potential dangers of factions in his farewell address. In the election of 1824, it was Andrew Jackson who secured the popular vote. However, during the election of 1796, the Federalist John Adams became president and his vice president was the Republican Thomas Jefferson.