Why did the war widen to become a world conflict?

The war widened to become a world conflict due to a combination of alliances, imperial ambitions, and nationalistic fervor among major powers. The interconnected web of treaties and obligations, such as those among the Allies and Central Powers, drew multiple nations into the conflict as countries were compelled to support their allies. Additionally, the expansion of colonial interests and the economic stakes involved prompted nations outside the initial conflict to join in, ultimately transforming a regional dispute into a global war.