Which was not a reason that the gupta economy thrived?

Although a number of things brought about world war one there was one even that push to europe over the edge. what was that event?

Ineed an answer asap. which is not a reason for the “era of good feeling”? a) economy in the us was booming. b) the united states was victorious in the war of 1812. c) the united states outlawed slavery. d) the federalist party was disbanded and the united states had one political party.

If i could get a answer for this timeline thing that would be : ) you all!