Around 2600 B.C., Pharaoh Djoser was entombed in what kind of step structure, the first large stone building of its kind?

Around 1964, North Vietnam began turning which famous supply route into a road that trucks could use? Around 2,000 years ago, members of which large African language family began settling in Angola? About 2 million years ago, which probable human ancestor, whose name means "handy man," was using simple stone tools? Around 2500 B.C., the Harappan civilization flourished along which river in Pakistan and northwestern India? Which early modern humans, named after a rock shelter in France, succeeded the Neanderthals in Europe? Beginning in 1940, about 300,000 members of which force were called into federal service, greatly expanding the U.S. Ar… Around 3500 B.C., people made which alloy by mixing copper with arsenic, before finding that copper and tin worked bett… Around 4,500 years ago, the Bronze Age Minoan civilization emerged on which Mediterranean island?