What forces of nature caused the grand canyon to form?

What kind of contact did christopher columbus and native americans initially have?

Plz me in 1756 george washington was sent on a mission to, a. build a fort at the point where the allegheny and monogahela 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 valley.

What does it mean to say the united states has a federal system of government