Proquest Congressional Digital Collection: The Changing Demographic Profile of the United States:

The Proquest Congressional Digital Collection, announced in an earlier post, provides efficient, targeted access to the most comprehensive collection of historic and current congressional information (Source: Proquest)
One part of the collection is the Congressional Research Service reports. With Proquest Congressional you have access to the non-partisan research that is provided for members of Congress. To limit your search to CRS Reports simply select Search Within CRS Reports:

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Access PDF versions of the Reports.
Here is an example of a 31 page 2011 report on The Changing Demographic Profile of the United States:

Summary:
The United States, the third most populous country globally, accounts for about 4.6% of the world's population. Within the next few years, the U.S. population -- currently estimated at 299 million persons -- is expected to reach twice its 1950 level of 152 million. More than just being double in size, the population has become qualitatively different from what it was in 1950. As noted by the Population Reference Bureau, "The U.S. is getting bigger, older, and more diverse." The objective of this report is to highlight some of the demographic changes that have already occurred since 1950 and to illustrate how these and future trends will reshape the nation in the decades to come (through 2050).
Source: U.S. Congressional Research Service. Changing Demographic Profile of the United States (RL32701; Mar. 31, 2011), by Laura B. Shrestha and Elayne J. Heisler. Text in: ProQuest Congressional Research Digital Collection; Accessed: July 5, 2011.
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