The GBD does not state that. Here is a fulsome list of measures from the document. Most countries do indeed do these (to the extent that they are possible)pic.twitter.com/YxgGBWFouC
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Maybe the US would not be in such a bad situation if they had followed the global gold standard set by remote Pacific Islands such as the state of New South Wales, population 7.8 million 
That's broadly untrue. Australia actually started closing borders AFTER the US during the initial wave, despite a large volume of traffic to/from Wuhan
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