Half our population was gone for five whole years, and the Flag Smashers, led by Karli Morgenthau (Erin Kellyman), are fighting to get back to the way things were before everyone returned, believing it to have been better.
A big chunk of the story in this debut season of The Falcon and the Winter Soldier is structured around The Blip, the time in the MCU when half the world’s population disappeared because Thanos the Mad Titan (Josh Brolin) succeeded in his maniacal quest at the conclusion of Avengers: Infinity War.