When the Know-Nothings get control, it [the Declaration of Independence] will read: “All men are created equal except negroes, foreigners and Catholics.” When it comes to this I should prefer emigrating to some country where they make no pretense of loving liberty — to Russia, for instance, where despotism can be taken pure, and without the base alloy of hypocrisy

I was surprised at the answer. 

Abraham Lincoln, letter to Joshua F Speed, August 24, 1855, from Albert J Menendez and Edd Doerr The Great Quotations on Religious Freedom.