[np-]

Not the op, but to be pedantic, every single international border crossing in the world is an official government “nationality discrimination” department. That’s what passports are for. (Not saying I necessarily agree with this, but it is the world we live in)

[robinsoh]

I'm just trying to understand the meaning of "I wouldn't want anyone to be discriminated" in the context of "Now i wouldn't want anyone to be discriminated but still it makes sense to limit green card based on nationality". I just think it is unclear. If we want to discriminate by nationality then we should just admit it and say we're going to discriminate by nationality instead of being covert about it.