Which of these events happened most recently? A. Lincoln issued the Emancipation Proclamation.
B. The last Northern state passed a law abolishing slavery.
C. The Civil War began.
D. The 13th Amendment was passed.

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:

food chain i would say only because there is competition on getting food and survival