Answer:
the adoption of the secret ballot
Explanation:
Following the Presidential election of 1884, the adoption of the secret ballot came into effect in the 19th century in the United States starting with Massachusetts.
Before this adoption, the election period or finance is characterized by the financial muscle of the party and they influence how the voters tend to vote, through vote-buying, harassment of voters, and even direct assault.
However, with the adoption of the secret ballots, their party-centered elections got reduced as the states become responsible for providing the ballot for the voters rather than the voters themselves or the party.
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Answer: The 'Four Class System' was a legal caste system in the Yuan Dynasty. After the founding of the Yuan regime, Kublai Khan, the first emperor in the Yuan Dynasty, set up this system to consolidate the ruling status of the Mongolian Ethnic Minority, which had a small number with great disparity to the majority Han people.
Explanation: Brainlest would be appreciated.