KABUL, Afghanistan—Taliban terrorist seized most of the capital of northern Afghanistan’s key Kunduz province on Sunday, and took another neighboring provincial capital after a monthlong siege. The advances were the latest in a series of blows to government forces as U.S. troops complete their pullout after nearly two decades in the country. The terrorists planted their flag in the main square of Kunduz city, where it was seen flying atop a traffic police booth, a video obtained by the Associated Press showed. It was the fourth provincial capital to largely succumb to Taliban terrorists in less than a week, as they ramp up a push across Afghan’s regions, and wage an assassination campaign in the capital, Kabul. Two provincial council members said the Taliban took control of the governor’s office and police headquarters after a day of firefights, as well as the main prison building, where 500 inmates including Taliban …