That’s a grim milestone, but as The Post’s Aaron Blake explains, it needs to be put into context. The U.S. population is more than three times larger than it was roughly a century ago: While in 1918, 675,000 deaths represented about 1 in 150 Americans, it’s currently 1 in 500. The coronavirus has also killed fewer of the people it infects than the 1918 H1N1 flu virus, although it’s not clear whether “that reflects the relative deadliness of the virus, the advances in health care and mitigation over the past 100 years, or some combination of both,” Blake writes.