@Jordi *******
It was easy for her. I'm an American citizen. We just filled out the application with me as the sponsor (she has no money of her own), provided proof I had money, provided proof of marriage, and she just explained in her interview that I was taking her and our son on a road trip around the USA to visit family. They tend to ask questions for her to prove that she's really married to me, but that's about it for a 6 month tourist Visa with a 1-year visitation window.
Once you successfully complete one Visa cycle without illegally vanishing into the American countryside, future Visas come even more easily.
If you're not married to an American, the process becomes much harder.