Should English be the National Language?

I feel since it was never set, many years ago. Since we officially do not have a national language. basically it should stay as it is. But if they decide to make a National Language, then we can use Spanish and English. Everyone some how or another migrated to the US sometime in History, Yes we have always spoke English here. But in the US history books a Spanish person (Cristobal Colon) Christopher Columbus found the US. So Since he discovered it I gues he shoud get some credit. Maybe??