Usage History of 'khalifates'

The following chart shows how frequently 'khalifates' appeared in printed materials over time. For example, the word 'khalifates' occurred 6 times in books in 1800 and 24 times in 2008. From 1800 to 2008, the word 'khalifates' was used a total of 950 times in books scanned by Google. See Reference: Google Ngram project.

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