I know you probably seem special, and many people of all nationalities are searched coming over that border.  In fact, most of the parties searched on that border are either American or Canadian.  They do very thorough random inspections of _everyone_.  Once you are flagged in the system there is no way out.  I&#x27;m sure in the questioning they dug into your background, and they do this with everyone... &quot;Why did you go to Canada, you are an American?&quot; (as if that actually makes any sense)
As a further fun anecdote from US land borders, they asked a German friend of mind when he was crossing from Mexico &gt; US via a land border whether he lived in West or East Germany (this was in the early 2000s).  They did this to see if he was actually German or travelling on fake papers.  lol.  The correct answer of course (which he gave) is, &quot;west and east Germany don&#x27;t exist anymore&quot;