The three major Islamic Empires: Ottoman, Safavid, and Mughal all dealt with religious minorities as they were conquering empires during the 1400 and 1500s. In the Ottoman Empire there were Jews and Christians present both of which were offered religious toleration but were often taxed higher and limited in their rights to certain careers in particular the military. In the Safavid Empire, the biggest issue was between Shi'a and Sunni Muslim factions. The Safavid were Shi'a and generally a minority between the two groups in the empires' conquered areas. The Safavid Empire also practice religious toleration of other faiths in particular Hindus and Buddhists in the far eastern reaches of their empire. Lastly, the Mughals who conquered a dominantly Hindu India were incredibly tolerant as they were vastly outnumbered. Again Hindus were limited in job opportunities but were allowed to continue practice. Eventually there will be a blending of faiths to occur in this empire as Hinduism, Islam, and even Buddhism find ways to exist together.
American isolationist sentiment actually began immediately following the Revolutionary War and then increased drastically after WWI, when many American troops died for a war overseas.
I believe the answer is: great personal fulfilment is achieved when a person is given the freedom to pursue that person's dreams.
According to Aristotle, every individuals that is born in this world had to pursue each of their own self's actualization, which is a situation where we felt that we truly use our full potential/capabilities. This could only be achieved if we let those individuals pursue the things that they care about and not restrict them with societal expectation that is not suitable with their talent.
That killed their possible rivals because they wanted the theone