What was not related to mining on the american frontier?

What was charles townshends development of a crop rotation system important to the industrial revelotion

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.

How was the u.s. economy different from european economies following world war 1?