Which event is an example of the alliance system

World War One, known as the Great War, was triggered by the alliance system. The outbreak of war became a domino effect because of the coalitions between major powers and their hostility against each other. These treaties are divided between two oppositions, starting with the Triple Alliances made up of Germany, Austria-Hungry, and Italy.

Explanation:

food and resources were plentiful.

women were encouraged to marry later in life so they could work in factories.