I would not really classify it as a country, because it was a rising and falling empire. It frequently gained and lost territory, and was enslaved under the Mongols. So, it is not a country, because countries have clearly defined borders.
But yes, it was in one piece and united most of the time. There were times in-between dynasties when the regional kingdoms would scuffle, but overall, it was one, as you say it, “country”.

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