How did the doll study the cause of integration?

The correct answer to this open question is the following.

The doll study helped the cause of integration in that the resolution of the Supreme Cause Brown v. Board of Education of Topeka, Kansas, of 1954.

The dolls were used in a test performed by Kenneth Clark. This experienced African American researcher had had investigations working with children to understand racial implications in their behavior. Let's remember that in this case, the Supreme Court changed the "separate-but-equal" decision of the past. In the Brown v. Board of Education of Topeka, Kansas, the Court decided that racial segregation in public schools was unconstitutional.

to unite muslims and hindus in resistance against british colonialism.