Why were the Vikings so successful in annexing territory? What military tactics did they use?

The Viking Age (793–1066 AD)

Explanation:

A great deal of the achievement of the Vikings seems to have been due to the technological complexity of their shipbuilding. Everyones ships tended to have been very swift. In east europe, Vikings frequently managed to navigate the vast river network, and that they would participate in trading more frequently than in attacking.

b. the 200th birthday of the united states

your answer is 1930's

explanation

this is just around the time the great depression was starting and putting the us ecnomy into ecnomic failure causing the goverment to take a much larger rule to try and pieace it back together