> in the US, whether you are permitted to enter and how long you may stay are determined by the person at the border
I don't believe this is specific to the US. The agent at the border always has the last decision on whether you can enter the country even if you have a valid visa and travel documents.
I don't believe this is specific to the US. The agent at the border always has the last decision on whether you can enter the country even if you have a valid visa and travel documents.