[Poohbah]

Okay, set the tiny tax-haven of Cuckooclockland aside. Name some other long term successful bilingual bicultural nations.

United States, 1776-1880s. There were very large tracts of this country that didn't speak English until the advent of compulsory public education, which in turn was a product of the Industrial Revolution.

[radicalamericannationalist]

I seem to recall a Civil War in that time period. If Civil War is success, I'd hate to think of your definition of failure.