How did the alliances cause tension?

Alliances caused tension by creating a web of commitments that made conflicts more likely to escalate. When one nation was attacked, allied countries felt obligated to respond, leading to a domino effect of military mobilizations and declarations of war. This interconnectedness heightened suspicions among nations, as they feared being drawn into larger conflicts. Ultimately, these alliances contributed to an environment of hostility and mistrust, which played a significant role in the outbreak of World War I.