|This is how our system of government works - there are rules and guardrails to make sure that privacy is not violated. The census is not about WHO you are, it's about WHERE you are. There is absolutely nothing in the Constitution that suggests that citizenship is an issue - it's literally just a body count. Why do we need to know who is a citizen and who is not? That was never a consideration.|
Then why, in the 2010 census are there questions regarding Gender, age, race and if you own or rent?