Believe it or not, we’re living in the most peaceful period of human history thus far. I’d recommend the book The Better Angels of Our Nature by Steven Pinker which talks about how far we’ve come. That said, I see the threat of global warming, lack of fresh water, famine, and energy scarcity becoming threats to the current status quo, though. If we don’t figure some things out as a species, we’re likely in for some turbulent times in the next hundred years.