Maxperson
Morkus from Orkus
US did not do well at all with travel bans, because they're inconsistent, and being handled in a way basically calculated to maximize the spread of the virus in the US. Look at pictures of people stuck in wall-to-wall standing room only for multiple hours at various airports because they announced a ton of new restrictions requiring manual checking, and didn't add enough staff to the federal-only process. So if even one or two of the people coming in did have the virus, now a heck of a lot more of them do, but will have gotten it right there so it won't show up in the superficial checking for symptoms being done on-site.
The travel bans are pretty much irrelevant I think. The virus would have started and been completely unknown for a month or two at least before anyone even thought to check and see why more people than usual were dying in Wuhan. That's at least two months of people getting it and traveling around the world infecting others, then it spreading locally.