Look for patterns in your evidence. To find out what your "controlling idea" is, you have to examine and evaluate your evidence. As you consider your evidence, you may notice patterns emerging, data repeated in more than one source, or facts that favor one view more than another. These patterns or data may then lead you to some conclusions about your topic and suggest that you can successfully argue for one idea better than another.
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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