Why did world war 1 become global in scope instead of remaining reginal conflict?

World War I escalated from a regional conflict primarily due to the complex web of alliances that existed among the major powers, such as the Triple Entente and the Triple Alliance. The assassination of Archduke Franz Ferdinand of Austria-Hungary triggered a chain reaction of mobilizations and declarations of war. Additionally, colonial ambitions and the involvement of empires drew in nations from around the world, as countries sought to protect their interests and territories. This interconnectedness transformed the war into a global conflict, with battles occurring in various continents and involving numerous nations.