http://www.lonestar.edu/library/kin_AmHistory2.htm

This is an excellent compilation of web sources on American history from the Civil War to present.

japanfocus.org

Japan Focus, published several times a week, collects analysis from publications across the world on Japan, Asia, and the US-Japanese relationships since the mid-19th-century.

Stratfor.com

Stratfor is a subscription-only service which offers daily analysis of contemporary crises and developments, often with important historical backgrounds to provide the proper context for the event.

http://www.u-s-history.com/pages/h1569.html

This is a good source on the Great Depression and its effects on the US, with additional links to further information on the Great Depression.