San Francisco International Airport (SFO) FAA Status: Advisory Due to RWY-TAXI / CONSTRUCTION, there is a Traffic Management Program in effect for traffic arriving San Francisco International Airport, San Francisco, CA (SFO). This is causing some arriving flights to be delayed an average of 47 minutes.
I'm fairly sure that I could get over a thousand wars in Europe in the last Millennia or so. So I'd say that there have probably been between 10,000 and 250,000 wars in human history. I'd expect a log distribution with very few wars with more than 100 million participants and a great many with fewer than a thousand.
Though it was fought mostly in Europe, people called it the First World War (World War 1). The Second World War (World War 2) lasted from 1939 to 1945. It was fought in Europe, in Russia, North Africa and in Asia. 60 million people died in World War 2. About 40 million were civilians. Children as well as adults were affected by the war.