How did actions by american presidents and their cabinets affect the civil rights movement?

Presidents have done much to help the cause of civil rights in America.  President Harry S. Truman ended segregation both in the military as well as the government.  John F. Kennedy and even Lyndon Johnson did much to enforce the law to allow Black students to study with whites as well called out the National Guards to help Black Americans register and vote.

its b they wanted to be able to expand their trade..

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now im just trying to get this to 20 characters hope it works hey it works hope it okay bye