Since 1802, the DuPont Company has supplied gunpowder to militaries worldwide. But when young Lammot DuPont pushed the company to get out of the business of war, it set off a conflict that transformed the family and the American industry for generations.

After graduating from Harvard, Joe Kennedy, the grandson of Irish immigrants, conquered Wall Street and Hollywood. When his political career was cut short he focused on his children. One became President and the rest devoted their lives to public service.