Famine is yes a pull factor in cases of needing to go to war but what are you asking exactly?
Jamestown
In 1607, 104 English men and boys arrived in North America to start a settlement. On May 13 they picked Jamestown, Virginia for their settlement, which was named after their King, James I. The settlement became the first permanent English settlement in North America.
Ur answer is in fact E, The North was running out of ways to finance the war.
For this question, Checks and Balances seems to be the best answer.
The Senate is making sure that the President is kept in check.
I hope this helps! :)
