Is it difficult to get USA visa?
It is not difficult to get USA visa. If you have documents completely and do not have any negative things in your police record, it is valid in every country that you can get your visa because the duty of the consulate is to give visa.
Your duty is to prepare your documents and do what they say and to persuade them that you will not stay in their country for long time, get around and return to your country. It is impossible to give a rate of being refused.
Especially it is impossible to guess it for America because you should appy for the visa individually. If you prepare your documents completely, you can get USA visa not difficult, easily.