P. 190 ff. Author: "From the early 1900s on, immigrants all over Europe understood that one of the main hurdles to admission into the United States was the matter of money- $25, to be precise.
"The information as to the $25 rule came from agents ... seeking out prospective immigrants; from steamship companies; from returning emigrants; from [press] articles; in letters from family and friends in America. The message was unmistakable: America is the land of the free, home for the homeless- but only if you can show $25 a head at Ellis Island."
...
"Oddly enough, it was only partially true. What was entirely true was that an an administrative regulation* was unevenly applied, resulting in an intentional gross discrimination against poor immigrants from southern and eastern Europe."
* n.b. not a _law_, federal or state. Evidently from the Commissioner of Immigration, no higher.
More to follow on this.
To be continued.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic