My mom's parents immigrated in the late 1950s (from a recently impoverished country despite having advanced degrees) and they were required to show proof of hav

My mom's parents immigrated in the late 1950s (from a recently impoverished country despite having advanced degrees) and they were required to show proof of having a job, proof of having healthcare, and proof having enough savings among other things I am sure, or so I was told (I think the requirements can be verified online if in doubt). They would have qualified as poor I imagine since they came with nothing and were fleeing their country. But there were completely different requirements back then. There are various ways one can immigrate to the US now, such as H-1B, DV, asylum, illegally, etc. I think only H-1B requires proof of employment before entering. I think the requirements previously may have filtered a lot of people in spite of education and net worth. Also, I am not sure what qualifies as being educated back then since having a bachelor's degree was a lot less common than it is now.