What role did alliances play in the onset of war?

Alliances played a significant role in the onset of war by creating a complex web of commitments and obligations among various countries. These alliances often led to the escalation of conflicts as each country felt obligated to support its allies in times of crisis. Additionally, alliances created a sense of security and strength for countries, which could embolden them to take more aggressive actions knowing they had the support of their allies. This dynamic could contribute to the escalation of tensions and ultimately lead to war.