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The Haijin (海禁) or sea ban was a series of related policies in China restricting private maritime trading during much of the Ming dynasty and early Qing dynasty. The sea ban was an anomaly in Chinese history as such restrictions were unknown during other eras;
the bans were each introduced for specific circumstances, rather than based on an age-old inward orientation.
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Search interest data over the past 12 months indicates that this topic periodically attracts global attention. Sudden spikes often correlate with major news events, public statements, or geopolitical developments.