This seems to be the trend among many of the patients who are familiar with Earth.

While the list was compiled mostly in chronological order, it is worth noting that the Cold War and Brush Wars technically overlap. In many ways, the ongoing nature of the Brush Wars was a direct result of the tension that existed during the Cold War, as they were fueled by two rivaling superpowers who sought to supply warring Asian countries with weaponry.

The fact only one of these conflicts seems to exist in your own universe is quite curious.