The formation of cultures and socleties has gone through a progression of steps. Place these steps in order. first
second:
third:
fourth:
fifth:
Hunter-Gatherers
Nation-states
Empires
Small towns and nomadic groups
City-states and small kingdoms

i really really really really really really dont know

the answer to your question is:

strong-mayor system

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.