What may be historic about this heat wave is how much of the country is being hit, at the same time, and how long it is lasting. Am not sure how the power grids are holding up.
I know it is worse elsewhere, but, here in Norfolk, it will be 100 tomorrow, and 102 on Sunday, probably followed by severe storms as a cold front finally pushes through. We are not used to this, at all, and humidity will make the heat index much worse. The only saving grace is that those people who work outdoors will be on their week-ends.