In An American Tail, the Giant Mouse of Minsk was the Golem! An artificial creature, larger than average but modeled after its creator(s), that drove off the oppressive forces threatening the helpless.
And, like the mice who came with Fievel's emigration group, the original Golem's creator was Jewish.
Henry the pigeon, who builds and lives in the Statue of Liberty, speaks some French. When you take into account that the statue is a gift to the United States from the people of France, it all makes sense!
The reason Honest John is depicted as an alcoholic is to invoke the maxim: In Vino Veritas.
There is, in fact, a grain of truth to the song 'No Cats In America'. Domestic cats were bred and kept by Europeans and brought along with their Pilgrim owners oversees, but were never native to the Americas. This misguided view can be also compared to the views of many immigrants (especially at the time) who first came to America based off of was was basically a bunch of rumors about freedom and wealth.
With the protagonist and co being mice, having cats as the allegory for oppressive higher ups makes sense. Immigrants from around the globe fled their home countries because of such people. People who, in truth, depended largely on the lower class if only for reasons raging from maintaining power over them to outright stealing from them. Yet this dependance doesnt stop them from treating the working class as less then human. In this light, it is easy to see oppressive overlords as being literal predators to the working class. Tying into this is the song 'No Cats In America', about how they're is supposedly no oppression whatsoever in America.
Unless we never see Fievel go through immigration at the end of the first movie, Fievel's technically an illegal immigrant!
In 1888? there was no such thing. If you got to the USA, you were legal.
They are animals and laws do not apply to them like that?
But we see the rest of his family become registered citizens at Castle Garden early on in the film, which makes the Fridge Logic more jarring. Although it probably didn't matter as much back then.
Minor nitpick, put they were not being registered as citizens but as residents. You didn't get citizenship until you had lived in the country for a certain amount of time and pass a test.
Maybe the Statue of Liberty flight happened right after running Fievel through immigration. They were in the right area for it to happen, and we don't know how much time has passed since the family's reunion and Fievel and Tanya getting a close up view of the newly finished statue.