" War is illegal. This idea seems obvious. But before the creation of the United Nations in 1945, no institution had the power to stop countries from going to war with each other. Although there have been some exceptions, the threat of international sanctions and intervention has proven to be an effective deterrent to wars between nations." I would argue that something else that happened in 1945 has been a much bigge…
The author covers that. (More details and argument for why he thinks that is in his book) https://stevenpinker.com/pages/frequently-asked-questions-ab... The explanation for the decline of violence in the second half of the 20th century is obvious: The bomb. The theory of the Nuclear Peace is evaluated in chapter 5, pp. 268–278. I think it’s unlikely. World War II proved that conventional warfare was already unthinka…
The U.S. was never going to chose between Spain and Canada in advance of actual fighting (or Canada and France re similar issues), because the larger nuclear-fueled conflict with Russia made dumping allies overboard foolish; whoever began shooting would have lost. I would argue that the nuclear standoff trickles down.