Mix racing started back in slavery time because the slave master would get the slave pregnant. Although, black is more dominant than white supposedly. They considered those children black. And then the same thing would repeat over and over again. So eventually a mulatto person who could pass as white didn't tell anyone that they had a black ancestor. Which they lived their life as being white. It even happen during segregation those causes would happen if you lack european traits you were considered colored. If you look up Latinos their nations are not one race it is a combination of European native American and African dna. So, we all are made up of the same dna some how but people just go by what they look.