The u. s. constitution mandates that a census is taken every ten years for the
purposes of

Apportioning the number of members in the US House Of Reps

Explanation:

The data collected by the decennial census determine the number of seats each state has in the U.S. House of Representatives and is also used to distribute billions in federal funds to local communities.

this is a good question! i'll do some research and come back when i have the answer!

urban people were mostly involved in jobs that required phyisical labor they are paid daily wages (minimum wages) from which they evoke their living. daily wages also mean that the day they don't turn up for work ,even due to sickness, they aren't paid anything.