Governor Reagan’s Three World Wars

I stumbled on this speech by Ronald Reagan, given May 20, 1967, while he was governor of California:

You know, I have no apology to make for our generation. Mistakes we’ve made to be sure. We haven’t achieved all that would like to have achieved. But still we are a generation that has lived through three world wars and a cataclysmic depression that shook the very foundation of our nation. I believe basically our generation has remained true to our belief in simple justice. We have remained compassionate to those less fortunate. We have stood firm in our duties to those who would come after us.

Again, this was in 1967. What were the three world wars? Obviously, there was WW1 and WW2. What’s the third? Korea?