Should America be referred to as "A Nation of Immigrants" or a nation of Citizens?

Why do we so easily accept America being referred to as a "Nation of Immigrants?" Shouldn't it be referred to as a nation of CITIZENS, by and for CITIZENS FIRST before "immigrants?" Since when do immigrants come before citizens? Where in our constitution is that written?

Should America be referred to as A Nation of Immigrants or a nation of Citizens?
America should be referred to as a nation of IMMIGRANTS.
America should be referred to as a nation of CITIZENS.
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Should America be referred to as "A Nation of Immigrants" or a nation of Citizens?
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