The methodology used in this list is deeply flawed. It depends on US Census Bureau data which does not make distinctions between subgroups of ethnicities, despite them being culturally and racially distinct from each other. Indians (which could be broken down into further subgroups), Afghani (which could be further broken down into Pashtuns, Tajiks, Uzbeks, Hazaras, etc.), Japanese and Laotians are not the same people but they'd all be classified as Asian. This does not paint an accurate picture of the incredible diversity that exists in the United States. In contrast, Uganda, which was ranked the highest on this list, has much more granular data available.
I'd urge you to pause your ignorant, inflammatory, and xenophobic takes for a moment to reflect on whether or not they're even true.
The United States Census Bureau's official population counts, as I've said, use very broad groups to categorize ethnicities which is not reflective of just how many groups of people live in the United States. Korea has an idea of how many Koreans are living in the United States currently [1] and you can probably type just about any sort of ethnicity, nationality, or race, and find some estimates or information about their presence in the United States. The Census Bureau does perform (unofficial) surveys that can give you a glimpse of the demographics in the US [2] [3] as well.
We have the largest population of immigrants in the world [4] and the nation is comprised almost entirely of non-indigenous people. The fact that the US is incredibly diverse is not controversial to anyone that is even modestly informed.
Here’s one fundamental problems with many Americans: they know nothing about outside world.