The 1851 census of Canada says he was 14 when taken, which would make his birth year about 1836 rather than 1838.
Michael died in the Civil War. However, the Civil War records haven't been found.
There are only two Michael Tracy's who died in the Civil War with death records. The closest is Michael Tracy born in 1837 in Bangor, Maine and died 19 August 1863 at the G H Baton Rouge, La Convalescent facility, and buried the same day in the national cemetery there. He was a private enlisted in Company K of the 14th Maine V regiment. There's another Michael Tracy, died 19 October 1864 in the Civil War and buried in the Winchester National Cemetery in Virginia. There are many other Michael Tracy's who enlisted in New York, and a few who enlisted in Maine.