The fundamental changes that occurred in the American political system that allowed the nation to become more democratic by 1840 were: (1) more white males won the right to vote, and (2) political parties became more organized.
American politics, from the 1820s through the 1850s, became in one sense more democratic and, in general, more partisan and more effectively controlled by national parties. Politics became more democratic as one state after another ended property qualifications for voting since the 1790s. As one state after another formally excluded African Americans from the suffrage, politics became more restrictive.
By 1840, almost all white men have the right to vote in all but three states (which were Virginia, Rhode Island and Louisiana) while African Americans were excluded from voting and women were disfranchised everywhere.
Learn more about the right to vote at https://brainly.com/question/946526.
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