Why have more Americans died from COVID in 2021 than 2020?
While other people are correct to point out that delta has led to more deaths than otherwise would have occurred and hence remains a serious public health threat, the majority of Covid deaths occurred in the first 3-4 months of 2021. This was a perfect storm of cold temperatures, reduced social distancing measures, and timing. The vaccination campaign mainly occurred after the deadliest months of the pandemic in early 2021. What we've seen since then are more cases but fewer deaths, and deaths almost exclusively among the unvaccinated.
The vaccines really do work.