“It is one of the richest counties in the United States...
Montgomery county is also “second place” in the U.S. as a sanctuary state/county. Are there people who earn a lot of money? Yes. However, in the communities with $500,000 dollar homes, there are the HUD houses/townhouses as well. In fact, in any newer community... a % of HUD houses have to be put in. Do you have Potomac? Yes. You also have Wheaton, Silver Spring, Gaithersburg, some parts of Germantown etc...
You raise a salient point. Forcefully "integrating" communities by placing housing projects in the midst of middle-class areas has been the major liberal strategy aimed at preventing the ghettoization of poor people. As we look back, would it have been better to keep the races separate so that blacks would have to sink or swim in their own communities? I'm not sure that would have worked, either; especially considering the riots following the MLK assassination.
Allowing slavery to continue in order to appease the southern plantation owners was the one flaw in our constitution that we will keep paying for ad infinitum, it seems.