The 1973 decision by OAPEC to impose an oil embargo on the United States in response to the dispute over Palestine led to major changes in the American culture.

It is the doctrine that the us had the right and duty to expand throughout north america. it just means they believed they had the right to expand westward and they did! they stated with the 13 colonies and then they kept moving gaining different territories throughout the years

Ithink it is space that makes up 70 percent