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.
Ver 11 For I know the plans I have for you,” declares the Lord, “plans to prosper you and not to harm you, plans to give you hope and a future. 12 Then you will call on me and come and pray to me, and I will listen to you. 13 You will seek me and find me when you seek me with all your heart."