When a big civilization falls, and a new one rises.
ex: the power of the Romans and Greeks fell, Dark ages started.
In China the era of dynasties started in 2100 BC
Mesolithic
The Era of Jazz began in the 1920's.
Yes, The Victorian era was 1837-1901 and the Edwardian era was 1901-1910 Because the Victorian era is named after Queen Victoria, and the Edwardian after her son who came to the throne on her death
the new name of era came to be called renaissance
9500 BC.
the mesoproterozoic was an era itself not a period.
Classical era
in the era of awesomeness when dinosaurs were alive.
The swing era in jazz started in the year of 1935
The NHL's modern era began in 1992.
In China the era of dynasties started in 2100 BC
President Nixon.
Mesolithic
1811
1824
The beginning of Earth's current era is marked by a mass extinction.