After the war of 1812, the united states was seen as a greater military power because
it had won a great victory.
they were not defeated in the war..
us land troops performed well.
it had defeated american indians.

I believe the answer is: they were not defeated in the war..

When two or more nations involved in the war, the losers would always be required to pay back every loss that the winners made in the war.

This would tend to resulted in economic growth for the winners and economic depression for the losers. So, by not being defeated in the war, United States automatically perceived as a great power that could influence other nations.

d: their own individual powers within the new goverment

the phenomenon that would be cited as evidence of increased economic interdependence between europe and the americas is  the development of mercantilism.

this theory suggests that the wealth of a country depends on its economic assets, or capital.

hope this : )