The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
The American Presidency Project's note on the remarks states that "the President spoke at 10:12 a.m. on the South Lawn of the White House" on 29 January 1979; 10:12 a.m. EST is 15:12Z.
What Deng told Carter about Vietnam, the agreements signed on 31 January and the reception the visit got in the American press.[1]
Background on the visit's place in the normalisation sequence.[1]
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Now, that doesn’t mean that they will invade in 2027, but certainly implies a significant milestone.