Question: What did the man whose cabinet Thomas Walsh joined as Minister for Agriculture lead the introduction of?

Related documents: [0]  [DOC] Thomas Walsh (18 December 1901 – 14 July 1956) was an Irish Fianna Fáil politician. He first stood for election at the 1943 general election for the Kilkenny constituency but was not successful. He was subsequently elected to Seanad Éireann by the Agricultural Panel and served until 1944. He was unsuccessful candidate at the 1944 general election but was elected to Dáil Éireann at the 1948 general election as a Fianna Fáil Teachta Dála (TD) for the Carlow–Kilkenny constituency. In 1951 he joined the Cabinet of Éamon de Valera as Minister for Agriculture, serving in government on one occasion. Walsh died suddenly in 1956 while still a member of the Dáil. The subsequent by-election was won by the Fianna Fáil candidate Martin Medlar. [END] 
[1]  [DOC] Éamon de Valera ( ; ] ; first registered as George de Valero; changed some time before 1901 to Edward de Valera; 14 October 1882 – 29 August 1975) was a prominent politician and statesman in 20th-century Ireland. His political career spanned over half a century, from 1917 to 1973; he served several terms as head of government and head of state. He also led the introduction of the Constitution of Ireland. [END]  
Answer: Constitution of Ireland
Constitution of Ireland