What history books are you reading? The United States has been at war pretty much continuously since its inception. Sixty five percent of our GDP is military spending, as is eighty percent of our national debt. We spent the first decade of the twenty first century involved in not one but TWO major land wars and are peripherally involved in four others.
The violence of our age is generally over-represented in the media. We have a tendency to turn the past into a golden age, but it's not really so:
With newness in the 21st century comes more rapid maturity...And with that, the ability of immature people to wield power irresponsibly. This is the point of technology you're not getting: just because somebody invents a better device doesn't mean the USERS of that device will be better people. For every RAMA that finds personal enlightenment on the internet there are ten Jihadist wackos who use the internet purely for downloading porn, stolen credit card numbers and bomb-making manuals (usually in that order) plus three guys on 4chan posting animated gifs of David Hasselhoff farting on Kim Katrel's face.
Social evolution tends to lag behind, but I would argue that it still moves at least parallel with technological development. Aside from the above Steve Pinker links, we can see the world reaction to wars and events since the 60s, protests and so on. Such points of view were not to be found in earlier wars to any great degree. Same thinkg with nuclear proliferation. According to Hans Rosling, social/health/organizational changes help increase influence more before
wealth does. Developing countries that gain wealth and influence solve social problems first to a great degree.
As far as the singularity goes, this is a totally different animal. I've already shared some thoughts on it, I feel we will perceive the world totally different after that point, and a transhuman transition period beforehand will make us more enlightened.
The technology alone doesn't change the agendas of the people who currently hold all the social and political power in the world; it hasn't, and it won't. The same technology that allows some peasants in Rwanda to learn CNC machining can just as easily be used by the Rwandan government to selectively exclude them from the workforce and keep the existing social order in place.
Not alone it doesn't but more than ever it provides tools to do so. The people and gov't that don't change agendas will be left behind. The use of these tools isn't supposition, it's already in evidence around the world.