Yes, you make good points here. Hispanics over time have tended to assimilate.
However, we ought to note a couple of things that must be taken into account now:
(1) Immigration from the other side of the Atlantic, a century ago, had natural, physical/economic, limitations, even before restrictive immigration laws were passed. If Latin America (including Mexico) were separated from the US by three thousand miles of ocean – or rather, if it was as difficult to get to the US today from Latin America, as it was in 1920 from Europe, things would be different.
(2) Even then, immigration was restricted. I don’t automatically shriek ‘racism’ and faint when I read about the laws of those times, by the way, even if today we can see that some of them were unwise. (For example, we should have taken all the Jews we could get, on purely selfish grounds, so they could make nuclear weapons and other useful things for us. How stupid the Arabs were, not to welcome the creation of Israel! Had they done so, and partnered with it, they’d be ruling the world today.) It’s interesting to read about those laws:[ https://en.wikipedia.org/wiki/List_of_United_States_immigration_laws ]
(3) Until relatively recently, almost all Americans, Left and Right, were very proud of America, and there was intense pressure of all sorts – not just coercive pressure – for new immigrants to become ‘American’ and to take pride in being so. In fact, many East European refugees became more American than the Americans.
[Which reminds me of an irrelevant joke: A group of East European refugees from Communism is demonstrating in front of the Soviet legation in New York City … they get angrier and angrier, and the demonstration starts to get out of hand. The cops weigh in and start shoving and even clubbing the demonstrators… One of them protests, “But officer, I’m an anti-Communist!” The policeman snarls, “I don’t give a shit what kind of Communist you are!” WHACK!]
Young Mexican-Americans had a strong tradition of military service, and not just any military service, but the Airborne. Do they still?
In fact, I find it remarkable how loyal to this country its racial minorities have been: the 442nd Regimental Combat team, the most-decorated American regiment in history, made up of Japanese-Americans, many of whose relatives were or had been in the camps.[ https://military.wikia.org/wiki/442nd_Infantry_Regiment_(United_States) ] Or Native Americans, or Blacks. I wouldn’t have blamed any of these people for saying ‘FU’ to us when we asked them to serve in our wars, but they didn’t.
But things have changed, radically, as everyone who follows this site knows. Now, the attitude towards America promulgated by our elite is just the opposite: not pride, but shame. Schools are beginning to teach not patriotism, but critical race theory.
This will inevitably affect new immigrants, especially those from the Left’s designated ‘victim groups’.
How much it will affect them – and this ‘despise America’ attitude on the part of the elite is going to get worse, not better – I don’t know, but I’m not optimistic.
(4) And of course you’re quite right to point out that the new immigrants of a hundred years ago were not without alloy. The anarchists of those times make today’s ‘anarchists’ look like teddy-bears. The Zinnized history taught to our kids portrays Sacco and Vanzetti, for example, as if they were gentle followers of Tolstoy, instead of what they were, followers of the violence-worshipping maniac Galleani [https://en.wikipedia.org/wiki/Luigi_Galleani] and almost certainly guilty of the murder for which they were charged – certainly Sacco and probably the more ethereal Vanzetti. (Honest anarchists like Paul Avrich come close to admitting this, but you’ll never hear that from today’s lying Left.)
(5) Then, America was on the way up, in every sense. Despite the pause of the Depression, our economy expanded – after WWII we ruled the world. We could absorb the numbers, and we were a nation people wanted to identify with. Now we’re on our way down. The next ‘America’ is China, but I wouldn’t suggest to anyone that they try to sneak across the Chinese border.
So what’s the bottom line:
1. We must control immigration. Who comes to the US and becomes an American citizen must do so only as the result of laws passed by current American citizens.
It’s just a brutal fact that citizens of a nation that is not bent on national suicide, should choose who comes to it to live on the basis of whether it will benefit that nation or not. Perhaps some day humanity will evolve beyond this attitude, but at the moment, there is no substantial material basis for this. The citizens of El Salvador would not accept unlimited immigration from Somalia. It wouldn’t even be a question. Nor should it be for the US.
2. Among the considerations governing immigration should be economic and social ones: will the immigrants contribute to our economy, or be a drain on it? Will they help maintain social stability, or be a destabilizing factor. Ethnicity cannot be left out of this calculation. You can’t fool life.
I assume the two points above are at a sufficient level of abstraction so that every sensible person would agree with them. The devil, as usual, is in the details.