In addition, these immigrants give birth to fewer children than their counterparts, possibly indicating cultural assimilation.

BBC: The equation of dual citizenship

Jacob Vignor of Duke figured that cultural assimilation is lower than a century ago, but has been on the rise since the 1980s.

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And the executives emphasized the cultural assimilation in their deal would be an easier transition than that for NYSE and Archipelago, whose own executives were until a few months ago trading barbs about their business models.

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They are against cultural assimilation.

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