Taco

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   OED has 1949, coined by AMERICAN SPEECH.  M-W has 1934.
   From Clementine Paddleford's restaurant review of Xochitl, 146 West Forty-sixth Street, NEW YORK HERALD TRIBUNE, 10 May 1947, pg. 11, col. 6:

   LITTLE SANDWICH--Those hot peppers in vinegar and oil are to order when a dish is chosen lacking in heat, such as egg combination and the tacos.  A taco is a sandwich, a tortilla folded around a spicy but not hot filling of pork, cheese, sausage or beef.  You can have these "soft," with the tortilla merely toasted, or with the tortilla fried.  To fry, it is dropped a second in hot shallow fat then quickly out and the filling placed on one side and the tortilla folded over while it's still limber.

   THE PALATISTS BOOK OF COOKERY (The Assistance League of Southern California, Hollywood, 1933) has "Mexican Tacos...87."
   John Mariani's ENCYCLOPEDIA OF AMERICAN FOOD & DRINK has 1930--a rare case where he beats M-W and OED.  No source is given.