Austria-Hungary declared war on Serbia on July 28, 1914, effectively beginning World War I. Historian Jon Meacham discusses the lasting effect WWI has had on the world.July 28, 2014
UP NEXT
U.S. military sea drones warn of potential threats
02:00
U.S., Japan conduct joint military exercises amid high tensions with China
01:49
Watch: Airman surprises his wife at her Air Force graduation
00:39
An exclusive look at U.S. Marines training in the Arctic
02:18
U.S. evacuates nonessential embassy employees out of Haiti
01:51
Osprey returns to flight after months-long grounding