There will be war in the streets of America. Things have been engineered that way.
The scenarios are many, the issues are complex. The current anger from the left, who are violently protesting against President Trump, is just one aspect of it.
But the Pentagon and the U.S. national security structure is increasingly looking towards the shifting demographics around the globe – people have moved from rural areas, and shifted into cities. Where ever conflict stirs, there will be a need for military and SWAT response to the call. Entire cities will be locked down; door to door sweeps will often have violent ends.
Throughout history, military forces either sought to avoid or simply had no need to engage in urban combat. Most military doctrine, and the strategic theory it is built upon, encourages land forces to bypass, lay siege to, or—if required—isolate and slowly clear cities from the outside in. The great armies of the world have historically fought for cities rather than in cities, a distinction with a significant difference. In cases where military forces had no choice but to operate within cities, the environment, almost without exception, proved very costly in both military and civilian casualties. Today, many armies have accepted that global population growth and urbanization trends will increasingly force military operations into crowded cities, and military forces must therefore be capable of conducting the full range of operations in large, dense urban areas.