He was a member of the Constitutional Convention of 1866 and served as district judge in 1866-67. He was removed by Philip Sheridan as an "impediment to Reconstruction." Ireland was elected to the House of the Thirteenth Legislature and to the Senate of the Fourteenth Legislature. As a legislator he opposed granting lands and subsidies to railroads, his work against the grant to the International-Great Northern Railroad winning him the sobriquet "Oxcart John." He served as associate justice of the Texas Supreme Court from 1875 until the Constitution of 1876 reduced that body from five to three judges. He was unsuccessful as a candidate against Richard Coke for the United States Senate in 1876 and against Gustav Schleicher for the United States House of Representatives in 1878.
Ireland was elected governor of Texas in 1882 and again in 1884. As governor he continued somewhat Oran M. Roberts's economic policy, although he reversed policies for the rapid sale of public lands and the state's purchase of its own bonds at high prices. He urged a persistent enforcement of criminal laws and reduced the number of pardons. His administration was marked by the Fence-Cutting war of 1883 and strikes by the Knights of Labor in 1885 and 1886. He worked to develop state institutions and to protect state lands. During his terms the University of Texas was established, and the cornerstone for the Capitol was laid. It was Ireland who insisted that the building be made out of pink Texas granite rather than imported Indiana limestone. In 1887 Ireland lost to John H. Reagan in a contest for the United States Senate.
He married Mrs. Matilda Wicks Faircloth in 1854. After her death in 1856, he married Anna Maria Penn in 1857. He had three daughters and later adopted his daughter's son, Patrick Ireland Carpenter. Ireland was a Mason and a Presbyterian. After his retirement from the governorship, he practiced law in Seguin until his death, on March 15, 1896.
30° 15.917, -097° 43.626
Texas State Cemetery