The two text structures that would best fit an essay about the most influential presidents in history, focusing on their influence on one another and the world, are:
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compare and contrast - This structure would allow you to examine similarities and differences among the presidents and their policies, leadership styles, and impacts.
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cause and effect - This structure would enable you to explore how the actions and decisions of one president may have influenced the decisions of others, as well as the wider impact on the world stage.
So, the correct answers are compare and contrast and cause and effect.