It’s more cold war. Been like this for all my time.

Sure there's been a wave of imperialist wars, but it would have to cascade out of control and legitimately threaten world superpowers directly for a world war to break out. All this adventurism taking place is unfortunately just par for the course. IMO something truly unprecedented like the US launching a ground invasion against Mexico would have to happen to set off a cascade. I don't think even airstrikes on Mexico would do it, only a ground invasion.

Edit: not even 3 days since I made this comment and I think I may be horribly wrong. Israel employing the same genocidal tactics in Iran that they did in Palestine, Shiite uprising in Bahrain and Saudis sending in forces to put it down, US and Israel setting the stage for Kurdish forces from Iraq to invade Iran, submarine strike on Iranian ship in the Indian Ocean, China and Russia providing satellite support for Iran, Israeli ground invasion in Lebanon. The cascade seems to have begun.