For example, (for me), the "important things" about world war 2 is, who, why and how... what was before, what made people make decisions they did, how did it start, what happened during, and why and how it ended... the exact date when some named general attacked some small city somewhere is pretty irrelevant (atleast not a thing you should keep memorized), but a lot of history classes focus on exactly that... on which date which unit/general took over which town where did they break through, etc... I'd prefer half less memorization data and a googling class for kids to find the dates needed, and more focus on the whys and hows, because history repeats itself, while dates and names don't.