That was a joyful day for District 42 because the global war finally ended.
All the Districts of the world agreed to ally with them and imposed the three worldwide laws that would prevent anything to happen that could cause a conflict among them.
The first worldwide law was the GBI. Every human being should have GBI to identify which district they were born in, what was their name, and their birthday as well. It would prevent people to hide their identities and invade other districts with bad intentions.
The second worldwide law was to make huge walls on the borders of each district, so they could separate completely from each other. It wasn't allowed even to spy what was happening in the domains of each district.