What are three changes that took place between 1820 and 1840 that changed American politics?

More people with the right to vote, better organization of political parties, greater competitiveness on the political scene.

Explanation:

That period was characterized by a higher degree of democratization of American society. By creating such an environment, the competition was formed on the political scene in the country. Voters had more choices, which is certainly one of the basic postulates of a democratic society. In this period, there is an evening of media involvement in the country's political life, which in certain situations criticizes certain political actions and phenomena.

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answer; mission;