An inability of the citizenry to cohere around a shared national identity can make it more difficult for the government to overcome collective action problems. To be clear: the ability of the state to marshal resources and provide for individual needs *does not depend on racial or ethnic homogeneity, but is greatest where there is a shared sense of national community and commitment to common wellbeing.
The pace at which a nation can integrate immigrants, of all cultures and ethnicities, in terms of education, employment, housing, and adherence to existing shared cultural norms, should be determinative of the rate at which immigrants are admitted.
The precise definition of "integration"