What caused America's gradual
abandonment of its policy of neutrality?

Answer

One of the things that caused America's gradual  abandonment of its policy of neutrality was the yearning for revenge on the pearl harbor. The United States abandoned neutrality as events in Europe and Asia brought nations toward war. Wartime strategies reflected on  the political and military goals of alliances, the resources which were on hand, and also the geographical extent of the conflict.

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to protect the united states' role as a world leader, president truman wanted to prevent the soviet union from spreading communism beyond its post-world war ii boundaries. he declared that the united states must assist any nations struggling to prevent a communist takeover.

the triple alliance. germany and austria-hungary were already allies by 1879 when, worried about a threat from russia, they formed the dual alliance. italy joined the group in 1882. there was a concern about a possible attack from france and the alliance needed powerful friends to defend it.