That's a PHD question. Way TOO wide for this forum.
I don't know...
India seems to have absorbed it well, as it is a land of immense diversity.
China has incorporated it, as it did Tao and Confucianism. China seems to be the idea that engulfs others.
In Japan, it certainly has helped to soften a fierce warrior culture although sometimes, it was integrated to it.
It seems to have had more of a nationalistic identifying force in the countries of south-east asia.
It has completely absorbed the nation of Tibet. Tibet without Buddhism is unthinkable insofar as the religion permeates every aspect of life.
In Europe and America, Buddhism is gaining more converts, but this movement has yet to make a major impact on the host culture.