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Investing.com
Get free historical data for EU Stoxx50. You'll find the closing price, open, high, low, change, and %change for the selected range of dates. The data can be viewed in daily, weekly or monthly time intervals
S&P 500 stock data
Historical stock data for all current S&P 500 companies
Stock market data can be interesting to analyze and as ...
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Quandl is likely to be your best bet. If you want price and volume data, you can look for indices (not all are available) or the continuous futures datasets (e.g. CHRIS/CME_ES1 for front-month S&P 500 futures).
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For data related to households, you can get pre-1990 data from NHGIS
https://www.nhgis.org/
Keep in mind, the U.S. Census changed the way the collect their "sample data" (items beyond the basic population county by age/race/sex - i.e. income, employment, etc) after the 2000 Census, when they switched to the American Community Survey (ACS). See the write up ...
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