The latest wave of foreign workers sweeping into American jobs brought Donato Soberano from the Philippines to Arizona two years ago. He had to pay thousands of dollars to a job broker and lived for a time in an apartment with five other Filipino workers. The lure is the pay -- 10 times more than what he made doing the same work back home.

But Mr. Soberano is not a hospitality worker or a home health aide. He is in another line of work that increasingly pays too little to attract enough Americans: Mr. Soberano is a public school teacher.