5 Things you NEED to know about the winter soldier
5 of 5 The New Captain America
The Superhuman Registration Act was passed, S.H.I.E.L.D's Nick Fury recruited Bucky to protect Captain America from government forces.
With the seeming death of Steve Rogers, Bucky became the new Captain America. Rogers did survive gave Bucky his blessing to continue as Captain America. Cap accepted a federal role, managing super-heroes.