The document summarizes some of the key causes of World War 1. Tensions had been increasing between countries as new stronger nations demanded more land. Specifically, the assassination of Archduke Franz Ferdinand triggered the war, as he was shot by Gavrilo Princip in Sarajevo despite warnings. This led Austria to issue an ultimatum to Serbia, and declarations of war began escalating between allied countries, dividing Europe into the forces of the Triple Entente and the Central Powers and starting the war.