Someone who supports extreme changes in a society is a liberal.
radical.
Jacobin.
conservative.

Someone who supports extreme changes in a society is a radical.

Radical: Advocating or based on thorough or complete political or social change; representing or supporting an extreme or progressive section of a political party.

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:

it   would try making the   president who would the economy get out of depression picked