how did presidential addresses and supreme court ruling begin to change the lives of the american people beginning in the mid 20th century

To remove racial division.

Explanation:

Removal of racial division in the education system of United States of America was the decision of the supreme court which changes the lives of american people especially black people in the middle of 20th century. Before 1954, white children having a separate school from black colored children so the supreme court made a decision to remove racial division from the schools and provide equal opportunity to black children and allow both white and black colored children to take education from the same place..