Squat toilets don't exist in America. All of our toilets are sit down toilets. However, if you are in San Francisco, you will notice that many of the sit down toilets have footprints on the seat. That is because old habits are hard to break, and most chinese will still use the sit down toilet as a squat toilet.
If you are planning a trip to Asia, and don't want to have to squat to pee, you can try this alternative
If you need to do more than pee, I suggest you wait until you get home, or learn how to squat. This has been an Asia public service announcement. :P.