Why did most americans think the united states should extend to the pacific ocean?

they feared invasion by mexico.

they had already settled the lands of the great plains and needed more room.

they wanted to make sure great britain did not claim the land.

they believed it was their right to possess this land.

The  pan-african movement  was an "emotional, cultural, psychological and ideological  movement  that began among the  african  dispora in the western hemisphere, for a closer  purpose, so that  african  people could feel secure, attain political, economic as well as psychological power visa vis other races or world regions" .

If i remember correctly it was caused by people hurling bodies at a country for some reason and them they all became infected

The preamble of the constitution was written to explain the aim of the constitution