Final answer:
The 12th Amendment constitutionlized the single ticket election, which changed the way Presidents and Vice Presidents were elected.
Step-by-step explanation:
The 12th Amendment constitutionalized the led to single ticket election. This amendment, ratified in 1804, changed the way the President and Vice President were elected by establishing separate ballots for each office. Previously, the candidate with the most electoral votes became President and the runner-up became Vice President, regardless of political party.
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