If you're referring to the militarization and aggression of Germany, there's a lot of debate as to why these nations didn't intervene earlier. The general consensus is that nobody believed Germany would take it as far as they did.
U learn more tech in the technical i think lol
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There are some 1.7 million black men under some form of correctional control, including probation and parole, excluding those held in local jails on any given day. That is about twice the 870,000 or so black men at least 15 years old who were enslaved in 1850.
Answer: Directional Selection
Explanation: Directional selection also called positive selection, is a form of natural selection in which natural forces of nature favours an extreme phenotype over other phenotype I.e when environmental pressure favours one phenotype more than another invariably forcing a population to evolve towards a trait.