Identify different ways that historians measure time.

they use B.C. (Before Christ), A.D. (Anno Domini AKA the year of the Lord), decades (10yrs), centuries (100yrs), millennium (1000yrs)

what are local authorities doing to fix the problem

explanation:

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.