What law allowed girls' to play sports?

There is no document or law that specifically states girls have the right to play sports. Title IX of the Education Amendments of 1972 states that no person in the United States shall be excluded from participating in any program or activity that receives Federal financial assistance, regardless of gender. This law is commonly called 'Title IX'. Click on the 'Title IX of the Education Amendments of 1972' link below to read the contents of the law.