Yes, there were other wee peaks 1914-18 and 1962-73. Interestingly, these wee peaks also were about 50 yrs apart.
But what about the 1930’s and 40’s? A LOT happened then.
1930s
-Hitler came to power; Nazis pass purity laws; Krystalnacht
-Stalin’s purges; millions starve; gulags full
-Japanese officer assasinations and militarism
-Victory bonus riots; Depression
1940s
-World War II
-Communists gain half the world’s population
-Mao kills millions
The problem is, you could do this with virtually every decade in history...