> H1B's are immigrant visas

No, H-1B visas are explicitly nonimmigrant visas for temporary workers. [1]

> They terminate in greencards after one renewal

No, they don't. You can apply for a GC, but there's nothing automatic about the process, and the GC is not guaranteed to be approved either.

[1] https://www.uscis.gov/working-united-states/temporary-worker...

No. It's dual-intent: https://en.wikipedia.org/wiki/Dual_intent

The term Immigrant Visa in US immigration specifically refers to a visa that would confer permanent residency (i.e. green card) upon entry to the US. H-1B is definitely not one. It is a non-immigrant visa. Immigration intent, e.g. “dual intent” that you are referring to is distinct from the fact that H-1B is a non-immigrant visa. It simply refers to whether you are eligible for the non-immigrant visa if you have a predisposed intent to immigrate permanently in the future. For example, if you are applying for a non-immigrant visa with non-immigrant intent like F-1, you are asserting that you do not intend to permanently immigrate at the time of your application. Dual intent visas do not have such restriction, thus you can apply for a green card without jeopardizing your eligibility for a dual-intent non-immigrant visa, but that does not mean the non-immigrant visa comes with the privilege or path of immigration in and of itself or confers any such benefit.

H1-B are non-immigrant visas in the sense they are temporary. However, they are dual-intent which means you can pursue permanent residency while in H1-B status.

There is nothing in the H1B that entitles you to a green card. You can only renew the H1B once, so after that you need to either somehow get a green card or leave the U.S.

Although the previous comment is very incorrect, this information is also not correct.

The greencard process is a multi step, often many year process. If you are from a country with per country limits you can be approved for a green card, which will allow your H1B to be renewed indefinitely, but you still have the alien conditions including needing to maintain the same/similar employment.

They don't "terminate" in GC but rest of your comment is correct.

They terminate in a GC or you go home. Only one renewal, not like the work visa I had in China that could be renewed indefinitely with no path to permanent residency.

This is false. Once you're past a certain point in the GC process, you will renew your status each year.

But at that point you are approved for a GC and are just waiting for the country quota.

and if you are born in India or China, you wont get a GC until you are in your 80's

Can still fail the i485 interview