When was the first jail built in the united states? will make brainliest!

In 1790, the first jail built in the united states.

Explanation:

In the United States, the first jail was built in 1790 in Philadelphia when the Walnut Street Jail added a new cell house to its existing prison and dedicated the new cell to the imprisonment of convicted criminals.

The system of the jail came into existence so that the criminals could send at a certain place where they can complete their term of imprisonment. Benjamin Franklin's was the person who invented the modern jail system.