Texas State Highway 43  State Highway 43 (SH 43) is a Texas state highway that runs from Henderson to Atlanta. SH 43 was originally proposed on April 23, 1919 to connect SH 42 15 miles north of Longview to Rusk via Henderson. That same day, an intercounty highway was designated from SH 43's north end to Naples. On April 19, 1920, SH 43 extended north to the Oklahoma border via Daingerfield. On August 21, 1923, the route had been further changed. The section from Henderson to Longview was transferred to SH 26, the section from Daingerfield to Omaha was transferred to SH 11, and the section from Clarksville to Oklahoma was transferred to SH 66, and the section from Henderson to Rusk transferred to SH 43A. The sections from Clarksville to Omaha and from Daingerfield to Longview were cancelled. (Daingerfield to Longview would later be restored as an extension of SH 149). SH 43 was reassigned to former SH 43A from Kilgore to Taylor, a new route to Leander, and SH 20 to Mason. On December 17, 1923, SH 43 was rerouted to end in Marshall. On January 21, 1924, SH 43 was truncated to Taylor, with the section from Taylor to Round Rock already part of SH 2B, Round Rock to Leander cancelled and Leander to Mason transferred to SH 29. On April 6, 1932, SH 43 extended back to Round Rock, replacing part of SH 2B. On February 9, 1933, SH 43 extended northeast to Karnack. On January 18, 1935, it extended to Caddo Lake Park. On February 11, 1935, SH 43 Loop was designated through Tatum. On July 15, 1935, the section from Karnack to Caddo Lake Park was cancelled. This section was restored on February 11, 1937. On September 26, 1939, the section from Round Rock to Palestine had been transferred to U.S. Highway 79 (cosigned starting in 1934). SH 43 Loop was renumbered as Loop 43. On December 16, 1943, another section was created from SH 49 to US 59 in Atlanta, replacing SH 300 and creating a gap in the route. On August 30, 1950, the section from Karnack to Caddo Lake Park was transferred to FM 134. On June 1, 1967, the section from what was then FM 1915 to FM 134 was renumbered as Spur 449. Instead, SH 43 was rerouted over FM 1915, which was decommissioned, closing the gap.