What societal force was in place in mainstream American culture until the 1960s that resulted in separation of people along racial and other lines

segregation

Explanation:

There was a societal force that was in place in mainstream American culture until the 1960s. This societal force was segregation that resulted in the separation of people along racial and other lines.

The United States remains a segregated society in respect of housing patterns and church membership despite all the legal changes that have taken place since the 1960s.

the answer would be voluntary exchange -

"the act of buyers and sellers freely and willingly engaging in market transactions. moreover, transactions are made in such a way that both the buyer and the seller are better off after the exchange than before it occurred."

hope this : )

-shy