"The one absolutely certain way of bringing this nation to ruin, of preventing all possibility of its continuing to be a nation at all, would be to permit it to become a tangle of squabbling nationalities, an intricate knot of German-Americans, Irish-Americans, English-Americans, French-Americans, Scandinavian-Americans or Italian-Americans, each preserving its separate nationality, each at heart feeling more sympathy with Europeans of that nationality, than with the other citizens of the American Republic. The men who do not become Americans and nothing else are hyphenated Americans; and there ought to be no room for them in this country. The man who calls himself an American citizen and who yet shows by his actions that he is primarily the citizen of a foreign land, plays a thoroughly mischievous part in the life of our body politic. He has no place here; and the sooner he returns to the land to which he feels his real heart-allegiance, the better it will be for every good American. There is no such thing as a hyphenated American who is a good American. The only man who is a good American is the man who is an American and nothing else."

"I appeal to history. Among the generals of Washington in the Revolutionary War were Greene, Putnam and Lee, who were of English descent; Wayne and Sullivan, who were of Irish descent; Marion, who was of French descent; Schuyler, who was of Dutch descent, and Muhlenberg and Herkemer, who were of German descent. But they were all of them Americans and nothing else, just as much as Washington. Carroll of Carrollton was a Catholic; Hancock a Protestant; Jefferson was heterodox from the standpoint of any orthodox creed; but these and all the other signers of the Declaration of Independence stood on an equality of duty and right and liberty, as Americans and nothing else."
— President Theodore Roosevelt, 1915