I can't make your conclusion from what you stated. I also don't know what you are trying to infer? Is the existence of poor test scores meant to be evidence that immigration is bad? Bad for who or what?

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Does the existence of bad test scores in districts populated by German/Irish-Americans prove that nativism is bad? Are you trying to control for other variables? Again, I think I might stick to what the big study says rather than trying to infer conclusions from some random anecdotes from a reddit comment.

But school districts populated by Irish-Americans and German-Americans have excellent test scores, far far better test scores than overwhelmingly Latino Los Angeles Unified School District.

Cedar Rapids, Iowa school district has 81% of its kids proficient in math and 81% proficient in reading. The college readiness index is 35. LA unified school district has 22% proficient in math and and 55% proficient in reading, and the college readiness index is 20. All of this info is verifiable on US New & World Report. Look it up.

But I thought you people said that immigration is an excellent thing. How the heck does it benefit our country to have masses of people who cannot speak proper English, lack a college education, and whose kids often get pregnant at 16 and sometimes form gangs like 18th Street Gang and MS-13? This is EXACTLY why immigration is even a political issue.