The world’s first crowded cities grew in river valleys like the Nile.

Evidence

The world’s first crowded cities and states grew up in fertile river valleys: the Euphrates, the Tigris and the Indus. This chapter’s object is associated with the most famous river of them all, the Nile. — Neil MacGregor, A History of the World in 100 Objects, 199

Categorization

• corroborated: 2 independent passages support this claim — Neil MacGregor, A History of the World in 100 Objects, 199
• XREF: connects to: The Egyptian state emerged from the administrative needs of Nile water control — Cedric J. Robinson, Black Marxism_ The Making of the Black…, 436