Why did president Ulysses s grant think that African Americans should have full rights?

President Ulysses S. Grant believed that African Americans should have full rights because he viewed the preservation of their civil liberties as essential to the principles of democracy and equality established during the Civil War. He recognized that their freedom and participation in society were vital for national unity and progress. Moreover, Grant's commitment to Reconstruction aimed to ensure that African Americans could exercise their rights, including voting, as a means to protect them from oppression and discrimination.