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(Bloomberg) -- The US Treasury Department was hacked by a Chinese state-sponsored actor through a third-party software service provider, according to a letter the agency sent to Congress on Monday.Most Read from BloombergMigrant Crisis Pushed US Homelessness to Record High in 2024Treasury described the intrusion as a “major cybersecurity incident,” since it was attributed to a state-sponsored actor, according to the letter, which was reviewed by Bloomberg News.Treasury was notified on Dec. 8 by