3. Part 3
 Aired: 4/8/2021
 Peck looks back at human migration, trade, and weaponry, and shows how Europeans used industrialized steel to conduct warfare from ever-greater distances.  Then, he explores the endless cycle of militarization throughout the centuries – from George Washington’s efforts to jumpstart American arms manufacturing, to the Monroe Doctrine, and finally, to the horrors of Hiroshima and Nagasaki.