There's a double negation in the sentence: no + not: Anonymous Because of no war or conflict, they do n’t need to build a strong army or buy a lot of weapons. If you don't want to get rid of because of, you can drop no and put the phrase at the end: They don't need to build a strong army or [to] buy a lot of weapons because of a war or a conflict. I don't know how idiomatic and/or natural that sounds to native ears, but it's certainly grammatical.
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AnonymousBecause of no war or conflict, they don’t need to build a strong army or buy a lot of weapons.