Which amendment allowed senators to be elected by the people, since previously senators were chosen by the state legislators of their own states? *

That is the Seventeenth Amendment.

Explanation:

For 125 years, American didn´t vote directly for Senators. State legislatures chose them. The 17th Amendment allowed the direct election of senators by citizens in the states. Senators are elected for periods of 6 years. The reform was passed in 1913.

i think i agree because it is telling you to always believe in yourself.