How did the united states manage to expand its territory across the continent

Plz ive been stuck on this question forever. in 1753 george washington was sent on a mission to a. build a fort at the point where the allegheny and monongahela rivers form the ohio river. b. attack the french at fort duquesne. c. attack the french at fort neccessity. d. deliver a message to the french demanding that they leave the ohio river.

In 1867 on way many american farmers responded to the difficulties they faced was to? a join the national grange. b form regional alliances. c protest against railroad rates. d pressure state legislators

What were the causes and effects of the war in 1812