McKenzie - Scotland > MO 1820's
I'm not researching the name, but have in my notes, the following citizenship record for 1826, from St. Charles Co. Missouri, Court Records, Book C, FHL #966170:
Kenneth McKenzie, native of Scotland, age 26, born B?ckelack (could be Buckelack or Backelack), Scotland, emigrated from Greenock, Scotland, landed at St. Louis by the "Mildan P?st an S: Peters".Declaration of intent was made Feb. 1822 (court not stated here), and this record for citizenship in St. Charles Co. was dated 17 July 1826., p. 48.
Hope it helps.
Mary