G In 1800 the United States stretched from the
Atlantic Ocean to the Pacific Ocean
Atlantic Ocean to the Mississippi Rwer,
Columbia River to the Atlantic Ocean
Mississippi River to the Pacific Ocean,
HEL

Atlantic Ocean to the Mississippi river

Explanation:

I was also stuck on this question and I was searching for maps of the U.S. in 1800, and saw it stretched from the Atlantic Ocean to the Mississippi river.

Hope this is correct and helpful!

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.