A research question might:
Source: Williams, Robert C. The Historian's Toolbox: A Student's Guide to the Theory and Craft of History. Second ed. Armonk, NY: M. E. Sharpe, 2007.
This site from William Cronon walks you through the process of selecting a topic and developing a research question.
Exploration is the important first step when developing your research proposal. While you may have an idea or topic in mind, the research question won’t come to you immediately. You will need to do some initial research and reading to find an angle to pursue, and, even then, your question may change as you find more information. Let your question be guided by research.
Developing a research question:
Level 1: Questions that can be answered with knowledge you have right now
Level 2: Questions that can be definitively answered with scholarly research
Level 3: Questions that cannot be definitively answered but can be researched and on which a position can be formed and supported with scholarly research
Level 4: Questions that cannot be addressed with scholarly research, either because of a lack of evidence or because they ask something that cannot be answered by citing evidence
You are looking for a level 3 question. Level 1 and 2 questions can help you think about a topic and find sources, but they are too narrow and too easily answered to lead you to an arguable thesis. Level 4 questions can inspire your curiosity and then be scaled back to a researchable scope.
Adapted from: The History Research Process guide from the Newton Gresham Library (Sam Houston University) and Developing Effective Open-Ended and Arguable Research Questions for Eleanor Roosevelt College