Well first, show where I said "first-world socialized democracies".
Second,
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Sadly, data prior to 1959 is lacking and would take some determined digging to find. Poverty rates prior to the "New Deal" are of course going to be high considering the affects of the depression and the dust bowl.
List of countries by percentage of population living in poverty - Wikipedia, the free encyclopedia
Feel free to look up the socio-economic structure of the ones you want to. Of course, you probably won't like the fact that data is based upon income vs cost of living, something that the US does not do, as reported by those local governments.
Take a look at standards of living.
Quality of Life Index by Country 2014 Mid Year
Look at all those socialist countries and closed market countries at the bottom.
Now take a look at cost of living
Cost of Living Index by Country 2014 Mid Year
Wow, look at all those "first-world socialized democracies" at the top.
The US, the least socialized of those nations is second highest in standard of living but way down the list of cost of living and near the bottom of people living in abject poverty (other than homeless people, we don't actually have a population living in abject poverty.)