Political violence rips apart several towns in southwest Texas. A far-right militia plots to kidnap the governor of Michigan. An armed mob of Trump supporters and conspiracy theorists storms the U.S. Capitol. Are these isolated incidents? Or is this the start of something bigger? Barbara F. Walter has spent her career studying civil conflict in places like Iraq and Sri Lanka, but now she has become increasingly worried about our own country. Redefines civil war for a new age.