Rep. Tancredos website has the quote in 1907 ...
BTW: Died: January 6, 1919 in Oyster Bay, New York
http://en.wikipedia.org/wiki/Hyphenated_Americans
JFK had something to say about 'hyphenated Americans' since Irish-Americans are some of the worst, pining for the `old Sod.' Not in this article but some say it was inspired more by his resentment at being excluded from WASP country clubs, poor guy.
And Tancredo had a very good response in the latest issue to this lachrymose Reason article.
http://reason.com/0602/fe.jd.americas.shtml
Okay, I stand corrected.....early 1919. I thought I knew Teddy's bio well enough. But I was only six days from being correct :D