Which battle was considered a turning point in the war because the Americans won, improving their morale and gaining support of foreign counties? ?

Explanation:

not sure where you are in history but the war with the british was a turning point because they gained their independence and they defeated one of the greatest nations in the world at the time

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.

the answer to your question is:

strong-mayor system