Road-side markers for the Texas-Louisiana boundary marker along FM-31 |
In the 1700's, French and Spanish land claims overlapped on the current Texas-Louisiana boundary. Of course they began disputing this New World boundary as each country claimed Texas. The dispute was still going on when the United States purchased the Louisiana Territory from France in 1803. The government leaders finally agreed to a neutral area between the Arroyo Hondo and the Sabine River. In 1819, the Adams-Onis Treaty formally defined the border. Questions arose again when Texas won its independence and became a republic in 1836. Texas appointed a joint commission with the U.S. to survey and mark an official boundary from the Gulf of Mexico to the Sabine River and on to the Red River.
The survey began on May 20, 1840 and after an exact spot was determined, a 36-foot pole was placed in the middle of a large earthen mound on the Gulf of Mexico beach. Proceeding north, they placed 8-foot posts which marked the number of miles from the 32nd parallel. When they reached the parallel, they placed a granite marker on the west bank of the Sabine River and then traveled due north to the Red River. The survey was completed in late June, 1841.
A few years later, erosion caused the granite marker to fall into the river and it was lost to history. Fortunately, the surveyors had placed a second granite marker on their northward path to mark the north-south meridian. On the east face of the marker they chiseled "U.S." and on the west face "R.T." for Republic of Texas.
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