Answer:A ballot is a device used to cast votes in an election, and may be a piece of paper or a small ball used in secret voting. It was originally a small ball (see blackballing) used to record decisions made by voters. Each voter uses one ballot, and ballots are not shared.
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Nothing here..
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United States Maritime Expansion across the Pacific during the 19th Century. The resulting agreement, the Treaty of Wangxia, was ratified in 1844, and soon thereafter U.S. ministers and consuls took up residence in China’s capital and port cities.
Hopes this helps I guess
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that would be volunteer bias because that would negatively affect our study.