What was common in eastern bloc nations​

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.

Why have some historians rejected the labels bc and ad as laels for periods in world history

How did the treaty of versailles cripple germany after world war one ?