Two things that are coinciding are happening at the same time.
Gettysburg
The writing and adoption of the Constitution coincided with the emergence of the Federalist and Anti-Federalist political parties.
Mauryan empire.
native literature
The seven years war?
Christmas and Hannauka
christmas
Christmas and Hannauka
native literature
European traders and missionaries
coincide is the present tense. coincided is the past tense
The invasion of Spain by Napoleonic Forces.