The first wave of European settlers arrived in the rolling Cross Timbers country of north central Texas in the 1840s. Primarily of Scotch-Irish origins, these pioneer farmers came for the most part from southern states, following the frontier as it shifted west of the Mississippi. They entered an area where Native Americans had been living for thousands of years. The Comanche posed a serious threat to the settlers, and in 1849, the U.S. Army established Fort Worth to protect the farms along the sparsely populated frontier.