Sometimes you will not be able to identify these elements in your early drafts, but as you consider how your argument is developing and how your evidence supports your main idea, ask yourself, "What is the main point that I want to prove/discuss?" and "How will I convince the reader that this is true?" When you can answer these questions, then you can begin to refine the thesis statement.
For the sample assignment above, both Spain's neutrality and World War II are topics far too broad to explore in a paper. You may instead decide to focus on Franco's role in the diplomatic relationships between the Allies and the Axis, which narrows down what aspects of Spain's neutrality and World War II you want to discuss, as well as establishes a specific link between those two aspects.
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