The Camp David Accords were signed between Israel and Egypt in September of 1978. This agreement was a formal peace agreement between the two previous warring nations which occurred under the guidance of President Jimmy Carter.
Well since the u-boats took out many allied patrols and shipments it made it harder for the allies to ship goods to England and other allies in the time of need....
They believed that American settlers were destined to expand across North America. People also thought that it would bring independence and bring economic opportunity. I hope this helps!