Slavery is not a function of capitalism, though. Capitalism is being able to 1) firstly, own yourself and your body 2) thus sell your labour however you wish. It's the alternatives economic systems that prevent you from being free.
Putting emotions aside for a second, slavery is very inefficient in a free market. It is not a coincidence free countries are all capitalist (and vice versa).
When did markets cause famine? We are living in an age of wasted food because we have so much cheap crap (as well as high-quality) available. People are too fat because there's no barrier to over-consumption.
Whereas a socialist system causes famines due to central planning leads to poor decision making.
Oh yeah. The US is guilty as charged, but there's no such thing as a free country that's not capitalist, until we live in a post-scarcity society. Technologically we are many centuries away from that.