Soo....ppl were showing up at ellis island and getting a pass with no problems huh?
jesus christ you dudes are trying way to hard to make something that just didn't exist.
borders and border control was always a thing, with all countries/tribes/etc.
ppl weren't just able to walk in to a place freely and do what they want, but I'll let you keep reinventing history as you wish.
You think that Ellis Island had quotas? That people applied for visas ahead of time? That you had to show a passport?
Upon arrival at Ellis Island, immigrants were ushered into a room called the Great Hall and paraded before a series of medical officers for physical inspection. Most were allowed to pass by in a matter of seconds, but those whom the doctors deemed physically or mentally deficient were marked with chalk and taken away for additional screening. Questionable candidates were forced to submit to more detailed questioning and medical exams, and any signs of contagious disease, poor physique, feeblemindedness or insanity could see an immigrant denied admittance on the grounds that they were likely to become a ward of the state. In later years, doctors at Ellis Island even devised puzzles and memory tests to ensure that certain immigrants were intelligent enough to find work. New arrivals could also face rejection if they were anarchists, had a criminal record or showed signs of low moral character. Despite the litany of guidelines for new immigrants, the number of people denied entry at Ellis Island was quite low. Of the 12 million people who passed through its doors between 1892 and 1954, only around 2 percent were deemed unfit to become citizens of the United States.
And Ellis Island was fairly late in the grand scheme of things, we're talking stats all the way to 1954, and they're still not requiring prior approval and accepting 98% of entrants.
https://www.history.com/news/9-things-you-may-not-know-about-ellis-island
The same was true in most of the world for most of human history. Immigrants showed up to a place and asked for entry, there was no "prior approval" or "quotas", and if you got in you got in. There was no such thing as an "illegal immigrant", if you were in you were in. The term "illegal immigrant" wasn't even in use until the 1930s after the racial quotas and bans started.
Heck, you can even see in the Bible places where Israel was ordered to treat immigrants well. The idea that they would have been denied entry in anything other than a war situation would have been antithetical, and Israel was as xenophobic and tribalist as anyone back then.