How did African Americans on southern plantations help the Union cause?
They negotiated with Confederate leaders to end the war.
They sometimes grew food for the Union army.
They left for the safety of Southern cities.
They fled to Union camps in the North or West.

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.