Actually, diversity is the essence of nature. There are a huge number of species on earth. However, contrary to the progressive narrative those many species battle each other every day for survival.
One secret to America's success in the past was the "melting pot" concept. There were shared values that immigrants adopted. We celebrated the values we shared.
Today's Latinos, Muslims and inner city black refuse to assimilate. Just like in nature, the species battle for survival. The problem is that whites are prohibited from fighting back.
The melting pot only melted Europeans. The blacks are not immigrants. The Mexicans are not here to assimilate.