Has the national government been successful in its attempt to provide civil rights for racial minorities or do you see more need?
This is, of course, a matter of opinion. My opinion is that the federal government has generally done about all it can to provide civil rights. It has not been able to provide complete equality, but that is a very different thing.
In the United States today, racial minorities (for what it's worth, I am not white) do not suffer from legal discrimination. Legalized segregation is unknown today and firms cannot openly discriminate in their hiring practices. These civil rights have been granted and are protected.
Of course, this does not eradicate either inequality or racism. I am not trying to say racism is dead. However, there is no civil right to have people think you are their equal. Racial inequality is not dead. However, it comes about largely because of a lack of opportunities in some non-white communities, not because minorities are being "kept down" by the government.
We are still a long way from a perfect society with racial equality. But this is not because of a lack of protection for civil rights.