Both the Civil Rights Act of 1964 and the Voting Rights Act of 1965 had a higher percentage of Congressional Republicans voting for their enactment than the percentage of Congressional Democrats.

You can check it out in The Congressional Record.

As for black economic advances, the most dramatic reduction in poverty among blacks occurred between 1940 and 1960, when the black poverty rate was cut almost in half, without any major government programs of the Great Society kind that began in the 1960s.

Liberals love to point to the rise of blacks out of poverty since 1960 as proof of the benefits of liberal programs, as if the continuation of a trend that began decades earlier was proof of how liberals saved blacks.

As for saving the country from riots, the facts show the direct opposite. It was precisely when liberals were in power that riots rocked cities across the country. There were never as many riots during the two presidential terms of Ronald Reagan as during one term of Lyndon Johnson.

Even during the 1960s, riots were far more common and deadly in liberal bastions like New York City than in Chicago, where the original Mayor Daley announced on television that he had given his police orders to "shoot to kill" if riots broke out.
 Daley was demonized for saying such a thing, even though Chicago did not have the loss of life suffered in liberal cities where mayors pandered to grievance-mongers and pleaded for restraint. In other words, the net effect was that Daley saved lives while liberals saved their vision.