Which belief suggested that the united states and it citizens had the right and duty to spread democracy across the continent and fill the land from coast to coast

This belief was known as Manifest Destiny

Manifest Destiny. It wasn't so much the belief that democracy should be spread as it was the believe that Americans were entitled to the entire continent.

the option which was not a function of missionaries in the northwest was the first one - they established posts for trading furs and other goods.

missionaries were sent around the world to spread religion and their knowledge and others - they were not merchants who sold furs and other goods.

speed =5445/33=165 mpm