Mackenzie at Union which might be called the capital of the Upper Missouri country was called King of the Missouri - The River and I by John G. Neihardt

In pursuance of the new policy Mr Mackenzie arrived in Bechuanaland as British Resident for the purpose of giving effect to the newly proclaimed Protectorate which had been established over the country outside the south western boundary of the Transvaal by the consent of the delegates from the Republic who had visited London to obtain certain modifications of the Convention of Pretoria - The Siege of Mafeking (1900) by J. Angus Hamilton

To Mackenzie we are indebted for a compilation of the Noctes Ambrosianae edited with such discrimination such ability such learning and such enthusiasm that it seems to me the work must endure as a monument not only to Wilson's but also to Mackenzie's genius - The Love Affairs of a Bibliomaniac by Eugene Field