I got 13/15 but I have an unfair advantage because you see plates from all over the country when you are in the military.  We get to keep the plates from our home state on our vehicle and you can generally see plates from all 50 states and most of the territories if you drive around the parking lots of most military bases.

7

10What's the history of the coat of arms on Maryland's plate, anyone know?

The Maryland arms are used quite prominently for a variety of purposes. In addition to appearing on what is technically the reverse (but the only side actually used) of the state seal, they also appear on the seal of the University of Maryland. The shield of the arms is painted on highway signs welcoming travelers to the state, cast into historical markers, and imprinted on Maryland license plates. The Calvert quartering alone appears on the seals of three Maryland counties, the combined Calvert and Crossland quarterings on three more. It has inspired a large number of other arms, including those of Baltimore County and the City of Baltimore, the Roman Catholic Archdiocese of Baltimore and the Episcopal Diocese of Maryland, Johns Hopkins University, the ballistic missile submarine USS Maryland, and a number of Maryland National Guard regiments and battalions. Finally, and most famously, the state flag of Maryland is a simple banner of the quartered Calvert and Crossland arms.   http://americanheraldry.org/pages/index.php?n=State.MarylandThanks Wally, it seems the seal was changed and changed again, I guess thats how they like it in Maryland. Fort McHenry, Star Spangled Banner and a baron cattle driver ???