In 1800 what country claimed the area west of the Mississippi River ​

Spain

Explanation:

In 1800 the territory of the United States extended as far west as the Mississippi River. The area west of the river—known as the Louisiana Territory—belonged to Spain. The Louisiana Territory was an enormous area of land, stretching south to the city of New Orleans and west to the Rocky Mountains.

Hope this helped!

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good question. i'll be looking into that. (this is a joke sir)

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.