Cone-bearing trees (like pine, spruce, and fir) grow best in areas where winters are long and cold. Large mammals like moose, elk, and bear also live and thrive in these cold areas
known collectively as the
biome.

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

How am i supposed to know your lecture