Why did the rational way of thinking, taught by Aristotle almost die by the 300 AD?

Because by 300 AD, Christianity, which promoted religious thinking, instead of rational thinking, was already spreading over most of the Mediterranean World, which was the same as the Roman World, since the Roman Empire dominated the totality of the Mediterranean.

In fact, only 13 years later, in 313 AD, Constantine, the Roman Emperor, decreed the Edict of Milan, which made Christianity the official religion in the Roman Empire, starting the period of Christian dominance in most of Europe, which continues to this day.

affirmative action refers to the policies that take gender, race, or ethnicity into account in order to promote equal opportunity.

employers subject to title vii are prohibited from taking race or sex into account in any employment decisions. aa is a penalty for having any job group substantially statistically "underutilized" in any race or either sex. the employer must take steps to eliminate the underutilization, then stop, ending its aa efforts

i guess so you did not explain the answer clearly so i can't