Question

What nation started world war one and what two
nations escalated the conflict

Answer 1

The event that led to the beginning of WW1, the assassination of Franz Ferdinand, was done by Serbian rebels, but the county was Austria-Hungary. The two nations that escalated the conflict was Russia, who supported Serbia, and Germany, who supported Austria. 

Answer 2

The assassination of Franz Ferdinand is what started WW1, which was done by Serbian rebels, but the county was Austria-Hungary. The two nations that escalated the conflict was Russia, who supported Serbia, and Germany, who supported Austria.