Below are some general resources for finding sources for Modern History. However, there are also dedicated sections for:
Fordham University provides a list of links to online primary sources from the modern era.
The British archive website which provides access to a huge range of materials.
British History Online contains primary and secondary sources for the history of the British Isles. You can find a diverse range of sources here.
Find real primary source film footage of major historical events from the late 19th century to the late 20th century.
An online academic database used by universities worldwide that is a superb resource for History students. To view full articles, you will require membership.
This searches internet sites for academic articles and books. It often only provides one or two pages, but it is often enough to find quotes and bibliographical details.