What impact did the US military have on world war 2 itself?

(I need to write a paragraph about it and find outside information, please help me if you can thank you!)

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.