In the presidential election of 1920, the following statements are true:
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Republican Warren Harding won in a landslide. - True. Harding won decisively over his Democratic opponent.
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The general sense of disillusionment felt by the American public was apparent in the result. - True. Many Americans were disillusioned after World War I and the tumultuous years that followed, contributing to Harding's victory.
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Democratic candidate James M. Cox won the popular vote but failed to achieve the presidency. - False. Cox did not win the popular vote; Harding won both the popular and the electoral votes.
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Wilson's postwar vision was rejected by voters. - True. Harding's victory was, in part, a rejection of the policies associated with President Wilson, particularly his League of Nations proposal and other postwar efforts.
So, the statements that occurred in the presidential election of 1920 are the first, second, and fourth statements.