Progressive speakers like to say that diversity equals strength. They assert that without diversity there can be no success. This kind of thinking doesn't take into account the possibility that diversity can and often does result in balkanization, or the division of a single body into multiple, mutually hostile, parts.
If a diverse population does not have a common goal, it cannot be strong. This is known from the other POV as "divide and conquer." That is exactly how government maintains its control over the American populace. By pitting black against white, rich against poor, documented against undocumented, the government prevents its population from becoming aware of the real problems the nation is confronting: debt, slow to non-existent economic growth, and increasing unemployment.
By manufacturing crises, the government engenders discontent and factions among the people. This type of misdirection is a tried and true method to prevent civil outrage at governmental action or embarrassment to the current administration. Whenever you see a sudden upsurge in crisis coverage in the media, you can be sure there is something going on in the background the government doesn't want you to know.
So, with that in mind, think about this: what is Russia really doing in Eastern Europe while "pulling out of Syria"? What is North Korea up to really while threatening to attack the US? And why does China not want to talk about it? On the home front, the government likes to say the unemployment rate is about 5% but even the Bureau of Labor Statistics admits this is a fraud. The actual rate as of March 2016 is 9.8%, nearly double.
So yes, diversity is strength - for the government. Think about that for a moment.