That's because it didn't even get started in the US until late March / early April 2020
Actually, there's evidence that COVID began circulating in China as early as October 2019 and that it likely was spreading worldwide by January 2020. We just didn't have a constant death counter in the bottom corner of 24-hour news channels until March 2020.
The start date of the coronavirus outbreak has been a subject of intrigue for scientists and many have suggested it may have been spreading long before the first case was detected in December 2019.
www.forbes.com
and while the mortality rate was pretty high throughout 2020, daily case counts were fairly low (relative to the rest of the outbreak) until about October 2020, when it started taking off, with the 2nd-highest average peak coming in Jan 2021. IOW, a lot more people got sick in 2021, because the virus had spread a lot by then.
Yes, but there were vaccines available on December 14, 2020. The rollout was swift. By April 2021, the US vas vaccinating >3.5 million people every day.
If vaccines slowed infections, then why after mass vaccination did the outbreaks get
worse? And why were highly vaccinated populations still seeing large outbreaks?
Unfortunately, the protection provided by COVID vaccines is incredibly transient. That's why some people are now on their 5th or 6th dose of the vaccine in <3 years. So even if the vaccine does provide a reduction in transmission immediately following vaccination, that protection wanes incredibly rapidly, making the reduction fleeting. If your risk of getting COVID immediately following vaccination is reduced but 4 weeks later is the same, does it really provide an appreciable benefit?
Further, it is known that young, healthy men are particularly susceptible to myocarditis from the COVID vaccines. It is also known that young, healthy men are at minimal risk of complications from COVID. And lastly, it is known that prior COVID infection confers protection that is equally as good, if not better, than the vaccine. With all of those knowns, it is highly questionable why vaccines would be mandated in a population of primarily healthy, young men.
Thankfully, the military has dropped this ill-advised mandate.