I was just looking at this tool earlier! This is not my area, but one thing that this tool can show is that among North American states, there's a noticeable difference in the distribution of clades sampled. The US is having a surge all at the same time, but I wonder if the differences in the virus seen in e.g. CA vs NY or FL is meaningful in terms of health outcomes. https://nextstrain.org/ncov/north-america?c=GISAID_clade&m=d...