I am a bit curious, I have built also such an app (though I have not yet merged the last PR) using the same source. But I have some issues:
This is the link to the API I am using.
I guess the data that you might be interested in is in csse_covid_19_time_series folder. To display the aggregated data for US I believe you might want to sum up the data from each state.
I thank you so much for the link.
You're right about US data, I just thought of it after I have submitted my request.
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