George Harrison met Muhammad Ali in 1964, when both men were on the cusp of worldwide fame. Ten years later, the two men simultaneously staged comebacks, demonstrating just how much they embodied the promises and perils of their era. In doing so, Tracy Daugherty suggests, they revealed the scope and the limits of political courage and commitment to faith in the modern world. We Shook Up the World is the story of these two larger-than-life figures at a momentous time.