Not all of them, and there's a lot of different subtypes of Orthodox. My comment is overly simplified but basically not even all types of Orthodox Jews can have a legal Israeli marriage, it's at the discretion of the rabbinical court.

I also actually didn't know this until now, but looks like other marriages are recognized as long as it's an approved religion, of which Reform, Conservative, Reconstructionist, & Renewal Jews are not.

Israel recognizes only marriages under the faiths of Jewish, Muslim, and Druze communities, and ten specified denominations of Christianity.

https://en.m.wikipedia.org/wiki/Marriage_in_Israel

They can all emigrate to Israel, but are not recognized as religiously Jewish. Most Jews in the US are Reform, the second largest group are various types of Orthodox. The chunk of US Jews that are unaffiliated are even larger than the US Orthodox population.

This leads to an odd situation where a huge chunk of Jews that emigrate to Israel are not actually considered religiously Jewish for the purposes of burial or marriage.

There are sects of Orthodox Jews in Israel (mostly Haredi, which is itself also a large umbrella with many subtypes) that are anti-zionist on religious grounds.