Which principle marked a significant threshold in the establishment of political equality when it was introduced?

Question

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Universal adult male suffrage marked a significant threshold in the establishment of political equality because it allowed all adult men regardless of their property status to vote and have a say in the political process. This broke down the previous system of only allowing property owners to vote and helped to establish a more equal and democratic society.

Which Principle Marked a Significant Threshold in the Establishment of Political