What economic question is being answered if an industry replaces some workers with a machines?

Which statement below would be the strongest evidence for the historians view

Diarys letters and memoirs are good examples of what

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.