Steve Rogers's own personal journey through the Marvel Cinematic Universe has been quite the time-bending trip, but it’s nothing compared to the journey of the mantle he so proudly wore. The Captain America timeline, following the title and the iconic piece of hardware that accompanies it, winds from the earliest days of the MCU well into its future. From Steve Rogers to Isaiah Bradley to Sam Wilson to John Walker, the shield has ricocheted and rebounded throughout the franchise, making an indelible impact wherever it strikes.
Aside from perhaps the saga of the Winter Soldier, no superpowered identity has undergone anywhere near the evolution that Captain America has over the past decade and change. The shield has always been a powerful symbol, but now it's also symbolic of the MCU itself - both where it came from, and where it's going from here.