The U.S. has a history of disenfranchised minorities. Surveys and censuses provide data (when given by participants...) that can be used to e.g. correlate media

The U.S. has a history of disenfranchised minorities. Surveys and censuses provide data (when given by participants...) that can be used to e.g. correlate median household income to racial demographics. Then, people who want to make the U.S. more egalitarian have data to work with.