The boyars, a high rank in the feudal system of Russia and nearby. They were aristocrats.
Answer:
C. The assassination of Archduke Franz Ferdinand in Sarajevo
Explanation:
As this assassination was done in Serbian territory, the Austrian-Hungarian government was extremely angered and used this event to bring Serbia into a fold. Obviously, Serbia did not accept the terms of Austria-Hungary and instead became allies with the Russian Empire.
No two situations are exactly the same
It’s most likely C: Mexico closed their borders to further immigration
But it could also be B: Texans owned slaves
A, D, and E are for sure not right because the Mexicans didn’t like how the Texans did that. Good luck!!