Hiring International nurse with an Associate Degree

No. You must have a minimum of a BSN if you want to immigrate to the US as an RN.

You don't need a bachelor degree to emigrate to the U.S. as a RN. I don't know what makes you think about changing a career, but your major problems will be:
1. To get admitted into the nursing program. Most schools have 2-5 year waiting list. The only exception may be the private schools that charge about $20k per year. Most of them award BSN (4 years).
2. It's pretty much close to impossible to get H-1B for a new grad nurse. You will not be able to file for GC either unless some comprehensive immigration reform will take place. Those international students who graduate now are only eligible for 1 year OPT. It's really hard to get a job in a decent place if you are on OPT. Most of the international new grad nurses will have to go back to school or to leave the county because of retrogression and inability to file for adjustment of status.

For US immigration you can do it with a ADN if done in the US however generally ADN is not accepted in other countries and with retrogression there is no guarantee that you can stay in the US once completed training.