It depends on if you're speaking British or American English.The British pronounce it as "istory," so they use "an" before.
No they don't - eg <a href="https://en.wikipedia.org/wiki/A_History_of_Britain_(TV_series)" rel="nofollow">https://en.wikipedia.org/wiki/A_History_of_Britain_(TV_serie...
dataflow · · focus · HN ↗
beaned · · focus · HN ↗
The British pronounce it as "istory," so they use "an" before.
gottheUIblues · · focus · HN ↗