Books are also a great place to start your research. Think of it this way: the author has already come up with a thesis and has done some of the research that you can build off of. If you get overwhelmed by lots of links and information overload sometimes a book can be more helpful. You can use the table of contents and index to find the exact info and specific chapter you need.
These books, and others related to your topics, are on a cart in the library.
ABC-CLIO Modern World HIstory Database
Hint: This database can also be used to find historical images for your presentation.