On January 26, 1837, President Andrew Jackson signed legislation admitting Michigan into the Union as the 26th State.
Michigan's admission marked a doubling of the number of the Original Thirteen States (not to be confused with the NHL's Original Six, of course). A curiosity of the event is that the Great Seal of the State, used for special official documents, has the date of 1835 on it, along with identification as "the Great Seal of the State of Michigan", a whole two years before admission. What gives?
In 1835, Territorial Governor Stevens T. Mason believed Michigan deserved admission and called for a convention to draft a constitution for entry into the Union. The document was approved and admission was sought that year. Two more years elapsed before the step was accomplished, due to a dispute over the Toledo Strip with Ohio, which blocked Michigan's admission until Congress insisted, as a condition of admission, that Michigan concede its claims. To compensate, Michigan's geography was expanded to the current Wisconsin boundary in the UP.
The Great Seal of Michigan features a Coat of Arms with a shield held by an elk on the left and a moose on the right. Since Michigan is on an international boundary, a figure of a man standing on a shoreline shows his right hand raised in peace. His left hand holds a weapon, just in case. The phrase "Si Quaeris Peninsulam Amoenam Circumspice" is below these figures and means, "If you seek a pleasant peninsula, look about you." This may be a reference only to the Lower Peninsula, given the mindset of the 1835 conventioneers, for the actual graphics were adopted at the Constitutional Convention of 1835. Lewis Cass created the design.
The Coat of Arms is familiar because it is shown on Michigan's State flag, first occurring in the year of admission. From then on, numerous flags were used bearing the Coat of Arms along with various designs and emblems. Not until 1865 was an official Michigan flag adopted. The design of this flag, recommended by A-G John Robertson and approved by Governor Henry Crapo, bore on one side the Coat of Arms on a field of blue and the arms of the United States on the reverse.
Michigan's State flag was first unfurled at the laying of the cornerstone at its monument in the Gettysburg National Cemetery, July 4, 1865. And it's largely the same today, nearly a Sesquicentennial later.