[guscost]

The World: 8000 BC - 2014 AD. Died of Global Warming.

But seriously, I don't agree with the choice to label our recent history a "leftward" movement. I would call it a gradual, and thus far successful evolution. It often includes progressive ideas spreading through society, but as the author correctly points out, many progressive ideas are never accepted (see eugenics).

I think the best way to explain it is to say that while the "conservative" side of our culture tends to favor stagnation, the "liberal" side of our culture tends to favor unchecked growth. On the one hand, it would be very unfortunate if our society stagnated for centuries like some have, but on the other hand unchecked growth is what cancer does, and that's not healthy either.