The answer is European nationalism
Austria-Hungary had invaded and crossed over into, Serbia and Russia was in an alliance with Serbia, so they felt as though they had to help out. Hope this helps.
Answer:
I think the answer is D. The colonial experience was one of absorbing British models of government, the economy, and religion.
Explanation:
I am not fully sure. But I hope this helps! Correct me if I made a mistake.
Answer:
umm abt 10 billion years ago because idk but thank you for the points i needed them.