When the glaciers that covered large parts of earth melted after the last ice age, the sea level became higher. t or f

True, i hoped this helped :)

C14 hope it your welcome

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