The chart shows cases leading deaths, but after 160 days the lines diverge. The noticeable departure between infections per day and deaths per day cannot be explained by a lag between infection and death. Until late July 2020 infections per day data was published by the CDC and deaths per day by the US government. In late July 2020 the US government required new infections per day be reported directly to the US government rather than the CDC. It will be interesting to see if infections per day change to match deaths per day after this.