Https://millercenter.org/president/fdroosevelt/impact-and-legacy this should help
<span>Candidates are unable to run for office if they do not belong to a political party.
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The 25th Amendment outlines the rules of succession to the U.S.
Presidency and Vice Presidency in the event of either or both of them
dying, withdrawing or being removed from office.
Segregation was an useful tool in preserving the economic and social dominance of the white southerners. With segregation the African Americans were being discriminated against and kept in socially inferior position thus enabling the whites to get better paying jobs and generally better positions thus continuing the cycle of economical dominance of the white southerners.