Answer:
Christianity is the answer to your question
It renewed the morale of the American public, but it convinced potential foreign partners, such as France, that American could win the war, and that it might be in their best interests to send aid
They wrote in the amendment clause into the original constitution allowing for constitutional amendments as long as they were approved by a 2/3 vote in both the Senate and House of Reps and wasn't declared unconstitutional by the Judaical or Executive branches. Also a amendment can not be erased from the constitution another amendment must be placed to void it. <span />
This should be under a Science not history, but the answer is
D. visual perception