I wrote an article in 2001 entitled "Immigration and Welfare " recounting a study done by Frank Salter  (the sociobiologically-oriented political scientist at the Max Planck Institute in Germany) on Moscow beggars. Some were Russians, just like the vast majority of the pedestrians. Other panhandlers were dressed in the distinctive garb of Moldova , a small former Soviet republic that gained independence in 1991. Finally, some of the beggars were darker-skinned Gypsies (also known as Roma ), who are visibly of South Asian origin.
"Unbeknownst to them, the beggars were being monitored by a team of ethologists (students of the science of behavior). The researchers counted each time a passerby gave money to a beggar. A pattern soon emerged. The Russian pedestrians preferred to give to their fellow Russians, with the Moldavians, their fellow Eastern Europeans, as their second choice. The Asiatic Gypsies were so unpopular  that they had to resort to a wide variety of tactics to scrounge spare change, ranging from singing and dancing, to importuning tightwads, to dressing up their children in crutches and eye-patches."
This wasn't an anomaly. Salter has compiled a broad array of evidence (summed up in his new book  Welfare, Ethnicity, and Altruism: New Findings and Evolutionary Theory) indicating that people tend to be more generous to those more closely related to themselves genealogically. He summed up the political implications like this:
"The liberal left supports generous welfare  but also policies that add to ethnic heterogeneity, such as high levels of immigration . It does not seem to have occurred to them that they must choose between maximizing the two."
David Goodhart, the editor of the fine center-left British magazine Prospect , mentioned to me recently that he used my article in writing his now famous essay in his February 2004 edition: "Too diverse?  Is Britain becoming too diverse to sustain the mutual obligations behind good society and the welfare state?" In it, Goodhart echoes Salter:
"A generous welfare state is not compatible with open borders  and possibly not even with US-style mass immigration."
Goodhart's reasoning is more rigorous than most because of his respect for both the great Edmund Burke  and the late William D. Hamilton , the English evolutionary theorist who may eventually emerge as the most influential English thinker of the second half of the 20th Century:
"Thinking about the conflict between solidarity and diversity is another way of asking a question as old as human society itself: who is my brother? With whom do I share mutual obligations? The traditional conservative Burkean view is that our affinities ripple out from our families and localities, to the nation and not very far beyond. That view is pitted against a liberal universalist one which sees us in some sense equally obligated to all human beings from Bolton to Burundi… Evolutionary psychology  stresses both the universality of most human traits and - through the notion of kin selection and reciprocal altruism - the instinct to favour our own… In any case, Burkeans claim to have common sense on their side. They argue that we feel more comfortable with, and are readier to share with, and sacrifice for, those with whom we have shared histories and similar values. To put it bluntly - most of us prefer our own kind."
After Goodhart's piece was reprinted in the Guardian , it caused a ruckus  in Britain among the politically and culturally dominant left. It's a little hard to figure why—his policy recommendations are rather weak tea—other than that nobody had ever had the courage before to say in polite society such common-sense truths as that welfare states work best in homogenous Scandinavian countries . Goodhart gently points out that just because "diversity" and "solidarity" may both be good things, they are not necessarily compatible. 
Some Americans on the right have taken up the cry  that therefore mass immigration saved us from socialism  or European levels  of welfare. Their argument is that since ethnic diversity tends to corrupt the workings of government by making politics into a scramble for tax dollars  and government jobs  for relatives, as the history  of Democratic machines in immigrant cities like Chicago and Boston testifies, that made big government less popular with voters.
Okay … but you've got to be a truly fanatical libertarian to argue that the more parasitical and inefficient the government the better. How about if we had honest, effective government and let the voters then choose the size of government they wanted?
Further, this immigration-prevented-socialism theory is a massive misreading of American history. There was never socialism in America because there was never feudalism in America. Contra Marx , the socialist urge grew not out of capitalism but out of the extreme inequality and rigidity of the aristocratic system, where the nobility owned almost all of the land by inheritance. Early in the century, a hereditary member of the British House of Lords complained that Prime Minister Lloyd George had created new Lords solely because they were self-made millionaires who had only recently acquired large acreage s. When asked, "How did your ancestor become a Lord?" he replied sternly, "With the battle-ax, sir, with the battle-ax!"
Fortunately, Thomas Jefferson worked hard to make land ownership extremely widespread in America, banning  primogeniture (the English tradition of leaving all the real estate  to the eldest son) and setting up a Federal bureaucracy to sell government land on the frontier  cheaply to the common man. Combined with the low population density of 19th Century America, this kept land costs low, wages high, and opportunity present. That is the historical basis of America's vast middle class , a foundation being undermined by the current mass immigration system  (and let's not even speak of President Bush's Open Borders proposal).
Moreover, America's relatively brief experiment with a generous welfare state was doomed by our African-American population. America tried to import the two fundamentals  of the Swedish welfare state—high welfare payments and an end to social disapproval of illegitimacy—beginning about 1961. In parts of the U.S., such as heavily Scandinavian Minnesota, this worked reasonably well. But American voters were confronted with stunning speed with the realization that African-Americans responded differently  than Swedes did to the new incentive structures . Welfare allowed much of African-American society to revert to African-style family structures. In Africa, men often expect to be provided for by their women. One group of African feminists recently estimated that women do four times as much work in Sub-Saharan Africa as men do. (See James Q. Wilson's recent book The Marriage Problem  for the normally covered-up details  on the relationship between African family structure and African-American problems.)
With paternal providers rendered obsolete, the black crime rate  skyrocketed and urban whites fled to the suburbs , selling their homes cheaply at great damage to their life savings. As early as the 1966 Congressional elections, the voters were in revolt. Over time, voters had their officials throw a vast number of dangerous young men  in prison and, in 1996, cut back on welfare  for single mothers. Social conditions seem to have stabilized and even improved due to these illiberal measures as the crime rate has dropped sharply and the black illegitimacy rate inches downward.
The conservatism of current American voters, so widely decried around the world, stems in large part from this increase in the black crime rate in the 1960s. The politically correct way to refer to this historical event is "white fear of crime,"  as if it was all a hallucination . But the statistics are clear that there is nearly a degree of magnitude difference in the crime rate between non-Hispanic whites and African-Americans. Blacks are imprisoned nine times as much  as non-Hispanic whites and commit eight times  as many murders. White Americans do not accept this behavior as their own.
That is why America is turning away from a Scandinavian-style welfare state.
[Steve Sailer [email  him] is founder of the Human Biodiversity Institute and movie critic  for The American Conservative . His website www.iSteve.blogspot.com  features his daily blog.]