Simplify the following text for a Grade 10 native English-speaking person.
Original: After World War II , several other forces were also leading the country toward increased equality for blacks , including their accelerated migration of to the North , where their political clout grew , and President Harry Truman 's desegregation of the military in 1948 .
Simplified: President Harry Truman 's desegregation of the military occurred in 1948 .