Sometimes the best way to choose a topic is to start very broadly and explore academic reference sources. These works, usually topical in organization (but sometimes geographical), are written by experts to provide overviews of research areas, summaries of scholarship, and recommended reading. They are a great place to get ideas, to discover influential historical issues you might focus on for your project, and get recommended books as a starting point.
Search by keyword and then use the options in the left-hand menu of the result list to the "Collection" to "Carleton College Reference" or to limit the "Material Type" to "Reference Entries" to find reference articles in Carleton's online and print reference books.
For example, try: stratification
CC Ref D 427 .M47 or ask a Reference librarian.
An amazing way to browse what was happening in the US and the world on a particular date or during a specific month. Includes the 1920's through the 1990's. The oughts aren't out yet. NOTE: they are all near but not right next to each other.
One of the largest and richest areas of Carleton's reference collection are books on gender and women's studies. Below are just a few examples.