Once the united states entered world war i, its navy played a key role by a)shipping soldiers across the ocean to europe. b)protecting american ports from german attack. c)escorting merchant ships across the atlantic ocean. d)supplying technology to the british navy.

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.