Information, including code books, for the General Social Survey. As the website states, "The GSS takes the pulse of America, and is a unique and valuable resource. It has tracked the opinions of Americans over the last four decades."
The World Bank is a website providing reports on development and economic data for the countries of the world. The Data & Research portion of the site allows one to search statistics, thematic research studies like climate change, and global trends in the world economy.
Statistical Abstract of the United States is the "authoritative and comprehensive summary of statistics on the social, political, and economic organization of the United States." The most recent edition in print is available in Beeghly reference (REF HA 202.S92) Many find the print version easier to use than the online version.