This data below was derived from the daily accumulation of deaths reported by all 50 US States and 6 territories and presented by "The COVID Data Tracking Project at The Atlantic."
I assume that means The Atlantic Magazine. I didn't find a reference to the publication other than their name, but their name was presented in the same style as the magazine so I'm pretty sure it implies the publication company. Another sponsor of the website is The Rockefeller Foundation.
Their data is presented in a daily accumulated form. The data was downloaded to a spreadsheet and daily totals were computed from the accumulated totals by subtracting the difference between each day. The results are presented from early March through today - July 15. See the comment below for the source page.
The daily average over the last two weeks is 624 / day compared to the two-week average during later April and early May is 1,820 - a factor of almost 3 times fewer per day.
I am perplexed about the one anomaly from June 25, but that's what the data shows.
SOurce data found here:
https://covidtracking.com/data/us-daily