What were the names of the two walls north of Britain that protected the southern half of the island from the fierce Caledonians?

Explain one example of how the u. s has struggles to balance energy independence and environmental

One specific historical event or development during the period 1786-1861?

How did the construction of the erie canal improve transportation in the united states in the 1820s? a. the canal connected the great lakes to the mississippi river. b. the canal connected the great lakes to the ohio river. c. the canal connected the atlantic and pacific oceans. d. the canal connected the great lakes to the atlantic ocean.