The purchase of Alaska helped the United States because Alaska became an important site of several military bases.
refueling station for ships.
source of natural resources.
link to Asian trade networks.

answer; /// the only one of the above that makes good sense is ( the poor,plz check luck

carefully examine the map above. based on your knowledge of colonialism in africa, the area attributed to belgium on this map is most likely the democratic republic of the congo.

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.

answer; sociological imagination;