In the first place we should insist that if the immigrant who comes here does in good faith become an American and assimilates himself to us, he shall be treated on an exact equality with every one else, for it is an outrage to discriminate against any such man because of creed or birthplace or origin. But this is predicated upon the man’s becoming in very fact an American and nothing but an American.
“If he tries to keep segregated with men of his own origin and separated from the rest of America, then he isn’t doing his part as an American.
“We have room for but one flag, the American flag, and this excludes the red flag which symbolizes all wars against liberty and civilization just as much as it excludes any foreign flag of a nation to which we are hostile. We have room for but one language here and that is the English language, for we intend to see that the crucible turns our people out as Americans, and American nationality, and not as dwellers in a polyglot boarding house; and we have room for but one sole loyalty, and that is loyalty to the American people.
Theodore Roosevelt, January 5, 1919 (The last public statement made by Roosevelt prior to his death on January 6, 1919.)