 Premise is: The advent of the Bronze Age (about 3200 b.c. ), and the spread of city-states ruled by kings, is marked by the appearance of royal tombs containing bronze objects in such places as Troy in the west, and Alacah??y??k near Ankara.
Hypothesis is: We know the Bronze Age started around 3200 b.c. because royals were starting to be buried with bronze treasure.