President Biden has set an ambitious agenda for his first 100 days in office. Why is there so much pressure riding on that small amount of time, which is less than 7% of an American president's four-year term? Ian Bremmer explains how the "first 100 days" idea started 88 years ago, when President Franklin Delano Roosevelt had to pull the United States out of the greatest economic crisis the modern world had ever known.

Watch the GZERO World episode: After the insurrection: will Congress find common ground?