What factors contributed to the united states becoming a world leader?
a. the united states winning the war and having a strong economy
b. the allies winning the war and us having a skilled labor force
c.
the united states winning the war and german scientists sharing their knowledge
d. the united states suffering no war damage and having a strong economy

b)

it created free trade throughout the colonial territories.

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: