WHAT DOES THE LAW SAY ABOUT My 30 year job was "eliminated", but now they are hiring a temp worker.

An employer needs no reason to eliminate a job and may presumptively do so at any time for any reason or no reason at all. This is so because employment in the United States is "at will," which means that either party is free to terminate the relationship without notice and without a good reason. The same employer is free to hire another worker on a "temp" basis and to make that person "permanent" if it wishes. In other words, despite your having been employed for a long time, you have no legal right to continuing employment.