In light of a failed far-right coup in December in Germany, fueled by ideologically and historically incoherent fantasies, a global trend is coming into sharper focus. This new trajectory reveals a dangerous hybridization of extremist ideologies and is distinguished by anti-government terrorism. Even with courtroom revelations of far-right seditious plotting related to the Capitol attack on Jan. 6, I remained uncertain that a new fifth wave of anti-government terrorism arrived — until the coup plot in Germany. I believed that global jihadists would remain the most persistent terrorist threat. After all the U.S., together with partner forces in Iraq and...