Final answer:
The author supports the claim by providing examples of each president's accomplishments.
Step-by-step explanation:
The author supports the claim that the four presidents on Mount Rushmore "represent the most important events in the history of the United States" by providing examples of each president's accomplishments. For example, George Washington led the colonists in the American Revolutionary War and laid the foundation of American democracy. Thomas Jefferson, as the Third President, played a crucial role in the country's expansion through the Louisiana Purchase. In this way, the author highlights the significance and contributions of each president.
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