Civic solutions in US vs "homogenous" nations

Christian style, no most Americans worship in the American tradition of Christianity. It is very different to how most Christians around the world practice.

Australia has almost 30% of our population born overseas, so struggle to see how this counts.

Looking at America from afar (and with some fondness) it seems that there are large differences in established populations. A 3rd generation New York shop owner as a general rule will be very different from an 3rd generation Appalachian coal miner.

This suggestion illustrates my point. In Canada, immigrants have to be reasonably fluent in English or French. A person who is unilingual French can qualify for immigration, provided they meet the other criteria. Our model of a nation is intrinsically more diverse than is the US model.

It is not just the percentages but also the number. In the US there are 22 ethnic groups that have more than 2 million members. There are half as many German-Americas as there are Germans, there are seven times as many Irish-Americans as Irish, one Quarter as many Mexican-Americans as Mexicans, as many African-Americans as Africans in Kenya, one quarter as many Italian-Americans as Italians, one quarter as many Polish-Americans as Poles, one seventh as many French-Americans as French, four fifths as many Scottish-Americans as Scots, one quarter as many Dutch-Americans as Dutch, nine tenths as many Norwegian-Americans as Norwegians, four times as many Native Americans as Canada, half as many Swedish-Americans as Swedes, more Jewish-Americans than Jews in Israel, etc.
Because many of these groups started immigrating when the country was sparsely populated many settled in one area and created a region that was unique with its own culture. So you have Pennsylvania Dutch, Minnesota Norwegians, New York Jews, Applachian Scots Irish, Boston Irish, Black Southerners, etc, all existing in the same country and they all have pockets of political power that need to be represented nationally.
Norway has a higher percentage of its population born outside its border than the US, but do they matter politically? There are only 5 non-white members of the Norwegian parliament. That is not a great way to measure political influence but it is one way.

I mean obviously in the technical sense of those who are not mentally retarded.

Not necessarily: cultural/social expectations do not always have to be encoded into law. You are not legally required to avoid picking your nose in the middle of the street, but its generally expected you should.

Nonetheless when potential immigrants those who fulfill these criteria should be given an advantageous position over those who do not.

Then why are there such large numbers of American-born students enrolled in ELL programs (http://www.csun.edu/~krowlands/Content/SED610/ELL%20Instruction/ell%20language%20change.pdf). Obviously I’m not suggesting that people’s mouths should be forcibly washed out of soap if they accidentally speak their native tongue, but English language use should be encouraged by the government and all tendencies towards bilingualism discouraged. Proposition 227 in California provides a good model of what should be done (http://en.wikipedia.org/wiki/California_Proposition_227_(1998)).

Again social expectations supported by the resources of the State does not necessarily require the force of law. Here one might consider the example of tobacco use-it is not completely prohibited but it is certainly actively discouraged by the State as well as society.

Basic manners expected in American society. Thus things such as norms against speaking loudly in public, spitting, and so forth.

I certainly mean those public actions but additionally personal tolerance.

I don’t think my ideas are particularly controversial, I merely advocate the application of these fine words of former President Theodore Roosevelt: