A fleet carrier is intended to operate with the main fleet and usually provides an offensive capability. These are the largest carriers capable of fast speeds. By comparison, escort carriers were developed to provide defense for convoys of ships. They were smaller and slower with lower numbers of aircraft carried.
The First World War was sparked in the Balkans in 1914 when members of Mlada Bosna, a revolutionary organization with predominately Serbian and pro-Yugoslav members, assassinated the Austro-Hungarian heir Archduke Franz Ferdinand of Austria in Bosnia and Herzegovina's capital, Sarajevo.
What region was referred to as the powder keg of Europe?. Before the start of World War I, many countries in Europe wanted control of the Balkans. Russia and Austria wanted Serbia and many European countries opposed the Ottoman Empire. The instability in the region eventually caused the First Balkan war in 1912.