Each of the twelve tribes provided cities for
1.) poor, levites, leaders
2.) taking tuns, casting lots, building special ones

straight down to hell mate

congress also has implied powers, which derive from the necessary and proper clause of the constitution and permit congress "to make all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states.

because they can and they wanted to.