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Which would make the best heading for this list of notes about the migration of african-americans during the reconstruction era?

How can we stop u.s. military drone strikes from hurting innocent people

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.