Colonial tension: Competition for colonies and influence, e.g., Germany with France and Great Britain in places like Morocco and Afghanistan
Balkan tensions: Conflicts involving Russia and Austria-Hungary in the Balkans, with Austria-Hungary aiming for Mediterranean access and tensions over preventing a Greater Serbia
Alsace-Moselle: German-speaking territory taken by Germans, leading to tensions with France
Economic Competition: Crisis between Germany and Britain from 1873-1895 due to industrial revolution-related economic competition
Arms race: Nations engage in an arms race, developing new weapons, increasing army sizes, and boosting military budgets
Nationalism: Rising independence movements, especially among allochthons like Polish and Slavs in Austria-Hungary
System of alliances: Triple Alliance (Italy, Germany, Austria-Hungary) vs. Triple Entente (France, Great Britain, Russia)