WASHINGTON — The 2020 U.S. Census will add a question about citizenship status, a move that brought swift condemnation from Democrats who said it would intimidate immigrants and discourage them from participating.The population count taken every 10 years is more than an academic exercise. It’s required by the Constitution and used to determine the number of seats each state has in the House as well as how federal money is distributed to local communities. It helps communities determine where to build schools, hospitals, grocery stores and more.Congress delegates to the commerce secretary the authority to determine census questions. Commerce Secretary Wilbur Ross had until the end of March to submit the list of questions to Congress. The department said the citizenship information would help the Justice Department enforce the Voting Rights Act, which protects minority voting rights and helps prevent the unlawful dilution of the vote on the basis of race.“Secretary Ross determined that obtaining complete and accurate information to meet this legitimate government purpose outweighed the limited potential adverse impacts,” the department said in its announcement.A coalition of state attorneys general urged the department last month to not add such a question, saying it could lower participation among immigrants and cause a population undercount.