Answer:
A) They were unsure they could protect themselves if attacked by larger nations.
The main reason why European nations formed alliances in the early 1900s was that "They were unsure they could protect themselves if attacked by larger nations," since nationalism had caused nations to develop an "us vs. them mentality".
Declaration of Independence: "life, liberty, and the pursuit of happiness"
Tertullian, Ireneaus, Jerome, Augustine
Explanation:
It was right in my lesson
