A few spelling grammar mistakes... nothing terrible!
#...where it could "deal with" with the... you've got the word 'with' twice in a row
#Native Americans shouldn't have brackets around it
#Section two, a couple of commas needed here and there... " Johnny's archenemy a Santee Native American" needs to be "archenemy, a Santee"
#" with brand new horseless carriage" needs either 'a' or 'the'... "with a brand new horseless carriage" for example...
#Medical University of South Carolina link doesn't work as the page doesn't exist. That's why it's in red...
Nothing major, good story!