Numerous countries rebelled against the Ottomans to establish independent states: Serbia, Greece, Bulgaria, and Albania.
The protector of Serbia has historically varied depending on the context and time period. During the late 19th and early 20th centuries, Russia often positioned itself as Serbia's protector, especially during conflicts with the Austro-Hungarian Empire. In World War I, Serbia was supported by the Allies, particularly France and Britain, against the Central Powers. The dynamics of protection shifted significantly in the following decades, influenced by geopolitical changes in the region.
The majority of the Roman Empire supported him because anyone who spoke out against him died.
Russia supported Serbia first, then when Germany entered the war (on the side of Austria-Hungary--the Central Powers), France and Britain joined in as well (on the side of Serbia--The Allies). Bulgaria joined in later (Central Powers), as did Italy (Allies). As it became truly a world war, Japan and the United States joined (part of the Allies), and so did the Ottoman Empire (Central Powers), and several other countries such as Portugal, Romania, etc. on the Allied side.
Serbia become de facto independent from Ottoman empire in 1804. and 1807. And de jure in 1830.
Only some provinces of Serbia and Romania.
When Serbia rejected the Hapsburgh ultimatum, Russia supported Serbia, Germany backed the Austro-Hungarians, who invaded Serbia bringing the triple alliance, (Russia England France) into the First World War. The Ottoman Empire backed Germany and Austro-Hungarians to create the Axis. Italy backed the triple alliance to create the Allies, which defeated the Axis, in 1918. Canada, Australia, New England and other Commonwealth Nations supported England, as they did in WW2.
Serbia because they wanted to be an independent country, however austria-Hungary wanted to rule them to make a larger empire and it was franz ferdinands idea
Yes, it was. It was an empire until Second World War
I don't know that it was State sponsored as such: Gavril Prinzip was a Serbian.
to fight for them
During World War I, Britain was supported by several key allies, primarily France, Russia, and later the United States. Other nations included Belgium, Serbia, Japan, and Italy, which joined the Allies in 1915. Additionally, countries like Australia, Canada, India, and New Zealand, as part of the British Empire, contributed troops and resources to the war effort. Together, these nations formed a coalition against the Central Powers, which included Germany, Austria-Hungary, and the Ottoman Empire.