Final answer:
The 17th Amendment to the US Constitution, which became law in 1913, superseded a portion of Article 1 that specified senators would be chosen by state legislatures.
Step-by-step explanation:
The correct answer is 17th Amendment. The 17th Amendment to the US Constitution, which became law in 1913, superseded a portion of Article 1 that specified senators would be chosen by state legislatures. This amendment introduced direct election of senators by the people of each state.