Hey, I know them! Garrett Igo marr. Nancy Haggard and they had 11 kids. I haven't created a profile for them yet, but Garret and his family are on my list.
Looks like they arrived in Red River abt 1846, so, yeah, they probably missed the cut-off point (which is statehood). But, as I said, I've also been adding a lot of later Red River folks, up into the early 20th century, as an aid to research, so have at it. (Also, it looks like a couple of their kids may have married people from earlier Red River families.)
I don't know low long you've been doing this stuff, but you might want to take a look at the nearly complete bibliography that I've posted on the One-Place Study page -- especially Pat Clark's The History of Clarksville and Old Red River County (1937), which is the standard -- not 100% correct, of course, but very useful because he descended form James Clark and he knew EVERYONE. (I have a copy of the 1st edition, but the full text of the book is available on Ancestry.)
Where you live matters, too, and how large your local library is, because a great deal of of the original source material on old Red River is not on Ancestry or elsewhere on like. I spent several hundred hours crawling around the courthouse in Clarksville in the '70s & '80s. Libraries like Dallas Public (where I was on the staff for 30+ years) also have large local history collections.'