Pew Research Center regularly makes available the full datasets that underlie most of their reports. There is a delay between publication of the report and the underlying data, however.
The Statistical Abstract of the United States, published since 1878, is the authoritative and comprehensive summary of statistics on the social, political, and economic organization of the United States. Access by year makes targeted historical research especially easy. Free access provided by the United States Census Bureau ended in 2012.
Presents the numerical history of the United States. It contains annual time series of quantitative historical information covering virtually every quantifiable dimension of American history, all from the earliest times to the present.
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