on various applications to different states

It is possible to apply to several states in the US at the same time? Like if I am already licensed in california, had applied there, yet, I am still applying to other states and ask for a reciprocity? Will there be a conflict?

I am a nurse in another country and plans to work in the US.

If you have a license you can apply to as many states as you want but will still have to go through the process of foreign trained nurse and meet their requirements whether it is application for license or endorsement. Ca will not give you a license without SSN but you can apply to another state via application for license and ask Ca to forward your results. If applying to numerous states it will add up in costs I would say much better to wait for things to move with your PD and when you know where you are going to live then apply to that state if you haven't already done so. Not sure why you want to apply otherwise to other states