Comic book superheroes were first introduced in 1938, seven years before the United States' emergence as the world's primary superpower at the end of World War II. Captain America's journey has been intertwined with America's progress throughout the decades. Known as the "Sentinel of Liberty," his character has frequently provided socio-political commentary on current events as well as inspiration and warnings concerning the future.

This work explores the interconnected histories of the United States and Captain America, decade-by-decade, from the superhero's introduction in 1940. Through a chronological analysis of Captain America's arc--from his origins to Chris Evans' portrayal of him in the Marvel Cinematic Universe--this book examines how Captain America's story provides a guide through America's tenure as a global superpower, holds a mirror up to American society, and acts as a constant reminder of who America can and should be.