...you are a lefty who views everything through the prism of race. So, if someone is talking about "diversity" or "homogeneity", your brain reflexively defaults to skin color. (As an aside, your default to the half-witted "White Nationalist" race-card cop-out is the same reflex at work.) You think an MSNBC newsroom, for example, is "diverse" if it looks like a rainbow even if everyone in it is part of the leftist hive mind. It's not your fault -- you've been conditioned to think this way by the propaganda you consume -- but it's important to point out for the purpose of this thread.

When I refer to "homogeneity" in America (or any other country), I refer to a people with a shared set of beliefs, experiences, history and patriotism/national pride. A "country" is not a landmass. A country is a people living inside the defined borders of a landmass. But it's not just any people. It's a people with a shared set of basic beliefs, history, experience and pride in their country. America wasn't America before Americans created it. France wouldn't be France without the French. Italy wouldn't be Italy without Italians. And so on.

Americans -- regardless of skin color -- used to share a more homogenous set of beliefs, experience, history and pride than they do today. There are multiple reasons for this that are beyond the scope of what I want to post here, but that's just a fact. The resulting erosion in that homogeneity is a net negative for the country and its national culture.