Just to be clear this isn't the first US patent, just the one assigned #1 in the current numbering system (I think?).
More info on the "first" US Patent. http://www.uspto.gov/news/pr/2001/01-33.jsp
More info on the "first" US Patent. http://www.uspto.gov/news/pr/2001/01-33.jsp
I'm genuinely curious what the reasoning is.