Ignorance - developed countries have never sent so many people to university.
War - Is less common in recent history and the wars we do get involved have fewer casualties. I know people will raise Iraq but you only need to go back as far as Vietnam to find a conflict that was an order of magnitude worse.
Poverty - Absolute poverty is very low in the developed world and decreasing elsewhere.
Dirt - Soap is cheap.
Disease - Smallpox, Malaria, Measles, Rubella, Syphilis, Rabies are all eradicated or falling heavily. Cancer is only so common because we live so long.
Frustration - Liberal values have given freedom to a lot of people that had been oppressed.
Hunger - Food has never been so cheap.
Fear - I live in the UK, there is nowhere in my country that I feel is out of bounds for me.
Overwork - Jonathan Sachs has a really good presentation on this, our hours have been falling for decades. Also technology has freed us from much backbreaking work.