What started the Spanish flu?

Government powers not provided to the national government in the us constitution but are rather given to the states by the 10th amendment is called?

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.

What were the sites of three major battles the french army fought between 1805 and 1809?