The USA along with Denmark, Israel, Malta and the UAE have the most active cases in the developed world in Sep 11, 2020: the exact 6th month after the WHO declared COVID-19 a pandemic. Brazil might have more confirmed cases than the USA from manipulation of pandemic data under Jair Bolsonaro's rule. The USA itself today has 6.5 million confirmed cases and 190-200,000 deaths, but there are now 40,000 new daily cases, nearly half of what it was on July 4.
India now surpassed Brazil as the 2nd highest number of confirmed cases, not a surprise because India is the world's 2nd most populous nation after China...a lower percentage of infected per capita than the USA, then again Brazil could be over 3% infected by now, that's higher than 2% each in Chile, Peru, Qatar and Bahrain. The pandemic has 28-30 million confirmed cases and 900-920k dead. Excess deaths can raise this to 1.5 million out of estimated 600 million infected.
And the top 12 nations in cases besides the USA: India, Brazil, Russia, Mexico (may be higher since Mexicans cross the border for available and free testing), Peru, South Africa, Colombia, Spain, Argentina, Iran, Pakistan and the UK (with a high case fatality rate, close to Andorra, Belgium, France and San Marino, an exclave in Italy, a hard hit nation itself- it has the Vatican or Holy see). In the USA, the Navajo Nation with 10% infected now has zero new cases this week.