According to the united states constitution, the federal census is used to determine the

Census is the way in giving valuable information including your family backgrounds, your ancestor, statuses in life, history and etc. Federal Census determines the amount of people, races, colors, head of the family, and etc. of a nation and use it as data in solving global changes and problems that may affect the government and the people. It is also use in determining the economy of a country like US

Internal combustion engines