Answer:
The Days, Month and years.
Explanation:
Still now Americans celebrate Gorge Washington's birthday of a Catholic calendar.
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I think you are looking for a work for it - and this word is "megalopolis"
Some examples of a megalopolis are:
A Taiheyo belt in Japan (with Tokio and Osaka)
Northeast Megalopolis with New York and Boston
Yangze River Delta in China
