That's a remarkably confident statement that's completely unprovable.
I could just as easily posit easy international travel, world trade, mass media, democracy, and many other things as more effective than h-bombs for bringing about the relative peace of the late 20th/early 21st century.
Those particular things have the added benefit that they generally don't risk the side-effect of world annihilation.
Though "easy international travel, world trade, mass media, democracy, etc." were not invented at almost the precise moment that all-out large scale wars ("world wars") on Earth ended.
I could just as easily posit easy international travel, world trade, mass media, democracy, and many other things as more effective than h-bombs for bringing about the relative peace of the late 20th/early 21st century.
Those particular things have the added benefit that they generally don't risk the side-effect of world annihilation.
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