The easiest, least bloody way to conquer another nation and culture is to COLONIZE IT WITH YOUR OWN PEOPLE AND CULTURE BEFORE YOU INVADE IT WITH YOUR TROOPS.
Our unenlightened, so called "ignorant" ancestors all knew this and were VERY careful who and how many people of other distinctly different cultures, religions, political leanings they allowed to live among them. It has to be people who WANT to embrace YOUR social system or they will make trouble and/or overwhelm and impose THEIR ways upon YOU. "Melting pots" of differing peoples DON'T WORK when no actual assimilation or "melting" is taking place.
Why has society degenerated to championing merely "smart" kids/young adults?
What happened to moral, dutiful, industrious, honest, humble, loyal,reverent, respectable, courteous, truthful, courageous, compassionate, considerate, independent, persevering, productive, diligent, responsible, resilient, physically and mentally strong, insightful, rational, self-sacrificing, self-disciplined, sensible and reasoning as well as reasonable?