In the united states, congress a)forbade the use of u. s. ground forces in cambodia and laos b)authorized covert south vietnamese attacks on north vietnam c)supported the invasion of laos as a deterrent to communism. d)gave president nixon the power to expand the war into cambodia.

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.