In the article "I Knew America Was Not Ready for a Woman to be President" the author suggests that our progress in diversifying the US presidency parallels the US history of the right to :

vote

Explanation:

The author suggests that our progress in diversifying the US presidency parallels the US history of the right to vote.

The right to vote also referred to as suffrage simply means that an individual should be free to take part in a political decision and choose whoever he or she wants.

The right to vote was mentioned in the Fourteenth Amendment, and it's a constitutional right and no one should be denied. Once an individual is 18years and above, such individual can vote.

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