The point of that graph is that in the past the US has always and only allowed immigration that benefitted the country in some way or ways. Other posters have already addressed this. Suffice it to say that we no longer need poor farmers, or, for that matter, to be blunt, cannon fodder or future cannon fodder. When the trend became a problem, such as in the 1930’s, we shut it down.
If we get in a long drawn out war with China, that might change. But technology and adequate resources are probably a better path, should it come to that. Plus, I’d like to think we are past the point of importing huge masses of people as cannon fodder. A limited number, to earn citizenship by military service, I am fine with.
You, though, seem to be saying that anyone in the world who wants to come here for opportunity should be allowed to. This is nonsense. The plain fact of the matter is, we can’t handle the immigrants we have here now, the illegals in particular. (I read somewhere we have 1/5 of the refugees and immigrants in the world, here in the US, already. I am still looking for confirmation of that, admittedly. But, “confirmation” really doesn’t matter.) Look at the mess CA is in, especially the population centers. Are you really advocating for 10x that, or worse? That is exactly what we will get if we let every “good” person who wants to come here, come here.
The truth is, this country, and the world, are far different than they once were. What has not changed is that our immigration policy should be tailored / corrected to benefit our country, as it always has been.
I say this as a person whose wife is a “3rd world” immigrant. We have MANY immigrant friends, and even she sees it.
Not to mention the fact that the deep state doesn’t care about immigrants—what they care about is the complete destruction and death of the United States. By allowing the invasion of millions of anti-American agents.