Final answer:
Nixon's re-election in 1972 was influenced by his foreign affairs strategies, campaigning for the 'silent majority,' and support for environmental protection.
Explanation:
Nixon's efforts in foreign affairs helped ensure his re-election in 1972. Nixon's diplomatic strategies, like the Nixon Doctrine, and his campaign for the 'silent majority' were significant factors in his success. Additionally, his efforts in environmental protection following the success of the first Earth Day also played a role in his re-election.
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