In Europe, scientists believe the virus (SARS-CoV-2) has mutated to be weaker and less contagious, probably a result of tough lockdowns reduced the number of human hosts and a "sign" the virus could been a man-made lab accident. In Italy and Spain, their lockdowns allowed more certain business sectors to stay open, then the Chinese government said they were lax and these countries did shut down non-essential businesses, due to continued spikes in daily new cases and over time, it began to decline. Allowing all businesses to stay open, but all the social distancing and wearing masks, you're still going to have more cases.
An US-European-Canadian-Australian joint collab are investigating satellite photos of increased parking lot use in Wuhan and other Chinese hospitals in Aug-Oct 2019 and internet search engine histories of "respiratory" issues and "diarrhea" to prove COVID was already present earlier than its discovery in Nov-Dec, and the possibility in Jan-Feb 2020, up to 10,000 Americans and Europeans each had COVID in similar fashion, a false belief it was a "respiratory cold" or just a "flu". Then around New Years in China and Leap Year day in CA, US, a few people start to die from pneumonia, cardiac arrest and organ damage for medical professionals and scientists to discover the disease or it's arrival.
In the US, however, in the northern hemisphere summer, 35 states (i.e. TX, AZ and FL) report weekly and daily record increases of cases, it's widely believed these states lifted their lockdowns to early or 9 other states (one of them is OK, the other AR and there's UT) never had a lockdown or stay-at-home order at all to curb the spread or "flattened the curve" as in hospitalization or ICU rates.
A few Northeast (NY state-NJ-CT) and West Coast (CA-OR-WA state) areas had a steady increase or a decrease, note they are highly populated, but to look at CA and TX, like AZ, are receiving ICU patients and people seek COVID tests from across the border: Mexico, where the country wasn't able to get their part of a pandemic under control. However, all those Mother's and Memorial days informal family and friend gatherings, as well a wave of riots and massive protests against racism and police brutality, I suggest we as a country don't do any more of them this summer (i.e. Father's and Independence days).