Which us president first explained the domino theory, which was concerned with the expansion of communism in southeast asia?

What was the primary concern for the missouri statehood question

Did the west show signs of cultural decline in the 20th century?

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.