Final answer:
The 17th Amendment to the United States Constitution allowed for U.S Senators to be elected by the people.
Step-by-step explanation:
The 17th Amendment to the United States Constitution allowed for U.S Senators to be elected by the people. Before the amendment, senators were selected or appointed by state legislatures. The amendment was passed in 1913 in response to scandalous elections and to make the selection of senators more democratic.