Says Pat:
White men were 100% of the people that wrote the Constitution, 100% of the people that signed the Declaration of Independence, 100% of the people who died at Gettysburg and Vicksburg, probably close to 100% of the people who died at Normandy. This has been a country built basically by white folks, who were 90% of the nation in 1960 when I was growing up and the other 10% were African-Americans who had been discriminated against. That's why.
To be fair, there were probably some non-white people that would have been willing to help with the Declaration of Independence and such if it wasn't for the fact that they were only considered 3/5 of a person and would have been horribly beaten and stuff. You know, minor barriers like that.