These Canadian writers need to brush up on their US History. US since it's formation with the 13 Original Colonies does not endorse or enshrine in Law any aspect of multiculturalism or multinationalism. US, like many countries in Europe, Japan, China, Russia,  are a 'melting pot' and any newcomers need to accommodate themselves to the dominant culture. In the US, the culture is based on European laws, values, the English language and the dominant religion of Christianity. 
Only a few countries in the world adopt the bizarre State-mandated and State enforced  policy of multiculturalism and multinationalism where every culture, no matter how misogynist is considered equal. As PM Trudeau said, Canada is the first post national state that stands for nothing.
I would wish no country in the world a worse outcome such as to be described by Trudeau, being post national and standing for nothing.
US enforces it's immigration policy for the benefit of the US no matter what 2 Canadians desire