https://coronavirus.jhu.edu/data/mortality

Of the countries with the highest number of COVID-19 cases, the US has the sixth least case to fatality ratio.

Mortality rate (the percentage of COVID-19 cases that were fatal):
USA: 2.6%
Canada: 4.6%

Proportion of cases in the elderly population, 50 and up:
https://covid.cdc.gov/covid-data-tracker/#demographics 35.5% USA
https://health-infobase.canada.ca/covid-19/epidemiological-summary-covid-19-cases.html#a5 39% Canada

The elderly are the most vulnerable to COVID-19 so keeping them away from the Sars-CoV-2 virus is essential in keeping the nuber of fatalities down.

Now, the absolute numbers of cases and fatalities in the USA is significant, but the USA has a high amount of population density in its major urban centres, which allow for the highly contagious Sars-CoV-2 virus to easily move from person to person.  So it will obviously hit more people in the USA than more sparsely populated countries like Canada.