check out this website https://nextstrain.org/ncov or follow @nextstrain on twitter. absolutely fascinating graphics of where different strains developed and traveled to. it looks, and don't take my word for it, that it went from china to Kazakhstan to belarus and into europe and approached washington state from that direction, as well as directly from china. many places seem to have multiple strains from different places. obvious travel has quite a lot to do with it. in the very original screen, where it start t==[ to show china, it also shows a spot in france. i know there was a very early french infestation involving a ski resort..and italy very infectious ski resorts and i think colorado. saw an article talking about people wiping noses on ski gloves and then leaving them on restaurant tables etc.