Places like Texas and Missouri have an unbelievable density of artifacts if you know where to look. I worked for a company that did an archaeological survey for a proposed reservoir in Texas. It took a whole field season with a team of people. There are many file cabinets of curated materials from that one site in a museum in Austin.
That would be TARL. Texas Archaeological Research Labratory. Young son used to work there.
Check out this website;
http://www.texasbeyondhistory.net/If you look at the Presidio Los Adaes site you may see a familiar face disguised as Louis Jurchereau de St. Denis!!!!
Bob