Why did european nations from alliances in the early 1900s ?

Question

Why did European nations from alliances in the early 1900s ?

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".

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the answer is c. many americans held nativist or racist views

roosevelt believed that in light of the country's recent military successes, it was unnecessary to use force to achieve foreign policy goals, so long as the military could threaten force. this belief, and his strategy of “speaking softly and carrying a big stick,” shaped much of roosevelt's foreign policy.