hi Rudrey, you can enter Canada or Mexico for 30 days (max) and enter the US without a visa if your visa has expired. all you have to do is not hand over your i-94 when you enter Canada/Mexico. keep it safe with you. I-94 is your ticket back to the US.

but if you apply for a visa in Canada/Mexico, situation will change. the above situation will no longer apply. if you get rejected for a US visa, you have to fly back to Nepal from there.