They give you either a link where you complete the census online or a physical booklet with all the questions present to collect data from the population. What happens if you continue disregarding the census in the US? When was the last census conducted on the entire country? Even then, is answering questions on the census mandatory for both citizens and tourists alike? Also, what are the repercussions for providing false answers?
That’s how a census works. They’re trying to understand how many people are in the country, including tourists. USA doesn’t do that, but I hope you’re not confusing the census for voting rights.