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.
Galerius stopped persecution of Christians although not for long. It was not until Constantine signed the Edict of Milan that the persecution came to a cease.
The Indian removal act was when john Adams went out to the west and removed all the Indians from their homes.
