Republicans supported civil rights legislation before democrats did and republican support for civil rights remains strong.
Incorrect.
John F. Kennedy first introduced the bill and after his assassination, Lyndon Johnson championed it.
The CRA was formally introduced in the House by Emanuel Cellar, a Democratic Representative from NY. In the Senate, the CRA was introduced by Michael Mansfield, a Democratic Senator from Montana.
When it came to the breakdown of who voted for the CRA:
Senate Vote Breakdown (June 19, 1964)
The historic 73–27 Senate passage broke down as follows:
- Democrats: 46 Yeas and 21 Nays
- Republicans: 27 Yeas and 6 Nays
House of Representatives Vote Breakdown (July 2, 1964)
The House overwhelmingly approved the final Senate-amended version with a 289–126 vote:
- Democrats: 152 Yeas and 96 Nays
- Republicans: 137 Yeas and 30 Nays
Barry Goldwater, Conservative Republican Senator from Arizona, led the opposition to the bill, ultimately running for President in 1964 as the Republican nominee on a platform of repealing the CRA.
Current support for civil rights is not a Republican position. In fact, there have been several Republicans, including Rand Paul, who have called to repeal parts of the Civil Rights Act because "States' Rights".
Recently the Voting Rights Act, another landmark piece of civil rights legislation, was gutted by a partisan Republican SCOTUS in a case brought before the court by Republican Legislatures.
A basic Google search would have benefitted you here, because now you look foolish and uninformed.