There are many different lenses for examining history. If your topic is well-known and extensively written about, consider how you might add to the conversation. Can you examine the topic from an unusual lens?
Political history (the history of a nation, between nations, the history of government and power)
Economic history (trade, finance, taxes)
Social history (minority and marginal groups, gender, race, relations between social groups)
Intellectual history (of ideas, education, of disciplines)
Religious history (beliefs, practice, structures)
Cultural history (popular culture, material culture, consumption, art)
Environmental history (relations between humans + environment, history of natural environment, of industry)