England's 17th-century colonial empire in North America and the Caribbean was created by migration. This migration is captured in the London port register of 1635, the largest port register for any single year in the colonial period and unique in its record of migration to America and to the European continent. This work analyzes the 7500 people who travelled from London in that year, recreating individual careers, exploring colonial societies at a time of emerging viability and delineating a world sustained and defined by migration.