Out of Brigham Young University, this provides a wealth of online sources for European history, with links to facsimiles and transcriptions. You can search by individual country, or in broad chronological areas. See also Brigham Young's World War I Document Archive.
The New York Times first came off the presses in 1851. On the online site, click on the Advanced button and use the "custom date range" feature to search on keywords (for example, try mckinley anarchist buffalo with dates between Sept. 1 and Sept. 30, 1901). Articles published up to 1922 can be viewed online for free. To avoid paying $3.95 per article after that, go to our complete collection of the NYT on microfilm, on Lindell's first floor.
The eugenics movement of the early 20th century was, quite literally, an effort to breed better human beings. Eugenicists encouraged the reproduction of people with "good" genes. They lobbied for social legislation to keep racial and ethnic groups separate, to restrict immigration from southern and eastern Europe, and to sterilize people considered genetically unfit. This site presents reports, articles, charts, and pedigrees that were once considered scientific facts—now discredited.
This large website is a useful source for primary sources. The creator of the website has compiled sources on a wide-range of topics pertinent to Victorian London. It is especially strong on social topics ---watch the dates!