Saccurately explains why the common era begins with the birth of jesus of nazareth over 2,000 years ago?

federal power is further limited with a system of checks and balances that gives each branch of government a measure of power over the others.

explanation:

necessary and proper clause. the congress shall have power to 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, or in any department or officer thereof.