As I look around, I see causeways, stair-stepped temples, feathered headdresses, and a busy city.

What civilization have I found?

new orleans or rio most likely rio

Explanation:

new orleans has causeways, im not sure about temples, and during mardi gras parades they do elaborate feathered head dresses and its very busy

rio is more all year round with the headdresses it has temples and very busy

world war i began in 1914, after the assassination of archduke franz ferdinand, and lasted until 1918. during the conflict, germany, austria-hungary, bulgaria and the ottoman empire (the central powers) fought against great britain, france, russia, italy, romania, japan and the united states (the allied powers). to new military technologies and the horrors of trench warfare, world war i saw unprecedented levels of carnage and destruction. by the time the war was over and the allied powers claimed victory, more than 16 million people—soldiers and civilians alike—were dead.

explanation: