The myth of a White Race, some great indefinable trans-national kinship group that includes northwest Europeans and a variable selection of other people, depending on who's prejudices are showing, is one of the Great Bad Ideas of human history. It is an evil superstition that has pervaded our history and culture, to no end of harm, and it is time to renounce it. Quitting racism may be as difficult as curing an addiction, but it can't be done without a formal and public decision to do it. And telling Americans to identify themselves by race is like telling a recovering alcoholic to keep liquor in the house. The truth is, there is no such thing as a White Race.
White people are people who died by ice.
Black people are people who died by fire. Living people can skip that box too. I suppose that there's some point in checking the American Indian or Alaska Native box if you are part of a political entity that has treaty obligations it wants enforced, but the Asian and Pacific Islander section has no legitimate governmental purpose. Not for any good and useful purpose. So start now.