What did FDR promise that caused people to vote overwhelmingly for him?

He promised the nation a "New deal" a way to help protect the nation from another Great Depression.

Explanation: The programs focused on what historians refer to as the "3 Rs": relief for the unemployed and poor, recovery of the economy back to normal levels, and reform of the financial system to prevent a repeat depression.

might be agreeing to participate ethically with other european nations in the slave trade

or notifying other european nations when taking possession   of african territories

i think it’s a i hope that right : )