Not all cities and countries reacted in the same way to the coronavirus pandemic during the first stage. Some where quicker than others. And that factor, more than any other, was the most important when it came to contain its effects. Nevertheless, the same mitigations and protective measures are being implemented all over the world; tools and policies that were put to use in the cities that successfully fended off the pandemic... and that those that didn't are currently activating with haste in an attempt to flatten the curve.