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>> Now i wouldn't want anyone to be discriminated but still it makes sense to limit green card based on nationality

> Why though? If Google is hiring an engineer, it doesn't make a distinction and does so purely on skill. Why should it matter if said engineer is from Argentina (arbitrary example) instead of India?

Because the priorities of the system don't have to be the same as Google's. Specifically, the US decided it prefers to get immigrants from everywhere rather than letting a couple big countries flood the queue.