Originally Posted by avenirv
"To obtain a residency in the U.S. you have to pass USMLE Step 1, USMLE Step 2 and USMLE Step 2 CS. Then during your U.S. residency you have to pass USMLE Step 3. "
this is not true.
you need step 1, that's all. even in your post you contradict yourself. just read what you posted; not a good logic for a medical doctor.
IMG's must pass Step 2 as part of their ECFMG certification. Without ECFMG, you cannot match and it is unlikely anyone will take you in the scramble nor prematch you (although that could happen). So, although it may not be required by the rules per se, it would be a severe disadvantage for an IMG not to have Step 2 done long before application deadlines.
For US grads, Step 2 is not a requirement.