Grant received fewer votes in the North, so the Fifteenth Amendment was passed to allow male African Americans the vote.
Explanation:
Ulysses S. Grant was the youngest elected President of the United States. He continued the Reconstruction era by stabilizing the economy, creating the Department of Justice and prosecuted the Ku Klux Klan.
He knew that with his agenda he did not have supporters in the Southern States and his support would lay in African Americans, so the way to give strength to these people is to give them voting rights and the government enforcement of civil rights. Because of that, in his inaugural address, he urged for the ratification of the 15th amendment.
Halting nuclear development would have been extremely difficult, because a lot of the world was trying to catch on to the metaphoric nuclear weapons train.
