Speaking for Bangladesh: everything from attitudes about women and Jews and gays to acceptance of free speech to business ethics to expectations regarding the rule of law.

My father was a college student at the time of the Bengali independence. He had great hope for the country when it adopted a constitution with western-style attitudes (secular democracy). But now he's bitter because the people reinstated the theocracy, made Islam the official religion, made the religious leaders ever more powerful, turned the democracy into dynastic rule by two families, and perpetuated the culture of corruption and graft that exists in government and business. This didn't just happen to them. They're not the victims of external forces. They got the government and society they deserved and tolerated.

There are good people and smart people in Bangladesh. Letting people immigrate in a controlled way, and an emphasis on adoption of American culture, works. But but letting them just import their culture wholesale would mean the destruction of what makes America worth living in in the first place.