the us gained land
They lost all the land west of the Appalachian Mountain to the Louisiana Purchase Territory.
It didn't gain any land. It did lose a lot of land, though.
It depends on the war.
This is a well-known way: (6 steps) lose lone lane land laid lain gain
Missouri was allowed to join the USA as a slave-state. Other territories within the Louisiana Purchase, south of Latitude 36.30, could also join as slave-states.
As no actual war is specified, the question is unanswerable.
Lots of people die. Land, money, and power are lost if you lose. If you win you can gain land, money, and power but still lose all three.
On politics the Louisiana Purchase had profound effects. The issue of the expansion of slavery became a huge topic, and eventually led to the 36. 30. Economically, it was a bolster, because people had an urge to move West to capitalize on cheap (or free), abundant, fertile land.
Lose
If you are talking about before the American Revolution, it would be the French-Indian War, where the french and the Native Americans were against the American colonists and the British, and the British won. If you are talking about after the American revolution, it would be in the Louisiana Purchase, where Napoleon sold Louisiana and basically all of the Midwest to the American Govt really cheaply.
land loses heat faster than H20
It affected our money and land. It affected our people. doubled the size of the United States Caused people to lose rights