The following picture and text was taken from an email that is circulating. I can't swear the picture goes with the speech, but it looks believable. And it has been associated with the speech at many web sites. I checked at Snopes, who label it "True" As an side, there is more to be learned about President Roosevelt and immigration at the Snopes page.
'In the first place, we should insist that if the immigrant who comes here in good faith becomes an American and assimilates himself to us, he shall be treated on an exact equality with everyone 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 person's becoming in every facet an American, and nothing but an American...There can be no divided allegiance here. Any man who says he is an American, but something else also, isn't an American at all. We have room for but one flag, the American flag... We have room for but one language here, and that is the English language.. And we have room for but one sole loyalty and that is a loyalty to the American people.'
Theodore Roosevelt 1907
History. It is a wonderful thing.