How did the conflict expand to draw in much of Europe

Austria-Hungary declared war on Serbia on July 28; Russia (Serbias protector) began mobilization; Germany (Austria-Hungary chief ally) demanded Russia stop. Russia refused. Russia's ally (France) began readying troops as did Germany. August 1, Germany declared war on France

Explanation:

china unilaterally claims the entire south china sea as sovereign territory, then builds artificial islands to bolster its claim. it suddenly activates an air defense identification zone over the east china sea, and threatens to down any aircraft that does not report its position. it builds roads into indian territory, then redraws the maps to show that it is actually chinese territory. the people's republic under president xi jinping is quickly becoming the bully of asia.