Given the task definition and input, reply with output. Answer the question from the given passage. Your answer should be directly extracted from the passage, and it should be a single entity, name, or number, not a sentence.

Passage: However, his religious views remain uncertain due to other statements that he made. For example, in his article, 'A Machine to End War', published in 1937, Tesla stated: Question: In the article's title, what did the machine hope to end?
War