Trying to compare results country by country is virtually impossible. Heck, even calling the combined NYC and upstate NY, "New York" doesn't make sense from population density standpoint. This thing was highly contagious, and tons of people arrived from Europe and elsewhere into NYC airports. Couple that with people living on top of each other, and spreading like wildfire was bound to happen.
Country by country differences that affect the comparison include: population, population density, age distribution, mobility (including freedom, ease and propensity of movement), number of cases unknowingly allowed in, mask and social distancing mandates, attitudes of self vs. community, testing protocol, contact tracing ability, honesty in reporting and more.
What the virus hitting NY hard first did do was to allow the rest of the country to flatten the curve, and prevent hospitals from being overrun. Even NYC hospitals didn't get hit like expected, as evidenced by The Mercy and The Javits Center hardly being utilized, but the rest of the country flattened out well.
Let's take one example that some people threw out this week: New Zealand's response was great! Look at their numbers! They are an island nation, with 1.5% of our population, and a pop. density 40% of ours (no sheep jokes), with 4.7% the number of annual inbound travelers, and 6 international airports vs. 149. The fact that NZ consists of 600 islands also limits their travel. And, if their economy shut down, would we miss their $200 billion GDP?
So, yes, congratulations New Zealand. You handled covid well. If only we could be your size, population and geography, we could then maybe compare your response to ours.
Trying to compare response and results is meaningless at this point.