In the United States, I would counter that immigration *can* be a factor. The U.S. "culture" promotes one or two children; however, many of the immigrant cultures promote many children. This comes as a result of either an impact of the church (as Frank pointed out) or an over reaction because the country of origin restricted child births (both governmental and environmental restrictions). There is a reason why the Latino population in Southern California went from a minority to a majority in one generation. By the way, I'm not trying to judge, here; I'm just making an observation.
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