Final answer:
The 12th Amendment altered how the President and Vice President are chosen by establishing separate elections for each position within the Electoral College.
Step-by-step explanation:
The 12th Amendment, ratified in 1804, altered how the President and Vice President are chosen. Previously, the Electoral College selected both the President and the Vice President, which led to issues such as ties and conflicts within the same state. The 12th Amendment changed the rules so that separate elections are held within the Electoral College for the President and Vice President, ensuring a more efficient and fair selection process.
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