Question: What is the year of the event which occured first,the 1972 United States Senate, or Margaret Chase Smith was born?

Context paragraphs:
United States Senate election in Virginia, 1972: The 1972 United States Senate election in Virginia was held on November 7, 1972.  Republican U.S. Representative William L. Scott defeated incumbent Democratic Senator William Spong, Jr..  Scott was the first Republican U.S. Senator from Virginia to be elected in over a century, as the most recent Republican Senator was John F. Lewis, who had held the seat during the Reconstruction era.

United States Senate election in Montana, 1972: The 1972 United States Senate election in Montana took place on November 7, 1972.  Incumbent United States Senator Lee Metcalf, who was first elected to the Senate in 1960 and was re-elected in 1966, ran for re-election.  After winning the Democratic primary, he moved on to the general election, where he faced Hank Hibbard, a State Senator and the Republican nominee.  Following a close campaign, Metcalf managed to narrowly win re-election to his third term in the Senate over Hibbard.

USS Sea Leopard (SS-483): USS "Sea Leopard" (SS-483), a "Tench"-class submarine, was the only ship of the United States Navy to be named for the leopard seal.  Her keel was laid down by the Portsmouth Navy Yard on 7 November 1944.  She was launched on 2 March 1945 sponsored by Hon. Margaret Chase Smith, United States Congresswoman from Maine, and commissioned on 11 June 1945 with Commander Robert E. M. Ward in command.

Maine gubernatorial election, 1948: The 1948 Maine gubernatorial election took place on September 13, 1948.  Incumbent Republican Governor Horace A. Hildreth, was term limited and seeking election to the United States Senate (eventually losing the Republican Primary to Margaret Chase Smith), thus did not run.  Republican mayor of Augusta Frederick G. Payne faced off against Democratic challenger Louis B. Lausier, defeating him in a landslide.

United States Senate election in Texas, 1972: The 1972 United States Senate election in Texas was held on November 7, 1972.  Incumbent Republican U.S. Senator John G. Tower won re-election to a third term.

Margaret Chase Smith: Margaret Madeline Chase Smith (December 14, 1897 – May 29, 1995) was a United States politician.  A member of the Republican Party, she served as a U.S Representative (1940–49) and a U.S. Senator (1949–73) from Maine.  She was the first woman to serve in both houses of the United States Congress, and the first woman to represent Maine in either.  A moderate Republican, she was among the first to criticize the tactics of McCarthyism in her 1950 speech, "Declaration of Conscience".

Declaration of Conscience: The Declaration of Conscience was a speech made by U.S. Senator Margaret Chase Smith on June 1, 1950, less than four months after Senator Joe McCarthy's "Wheeling Speech," on February 9, 1950.  Her speech was endorsed by six other liberal-to-moderate Republicans.  In it, she criticized national leadership and called for the country, the United States Senate, and the Republican Party to re-examine the tactics used by the House Un-American Activities Committee (HUAC) and (without naming him) Senator Joe McCarthy.  She stated the basic principles of "Americanism" were:

United States Senate election in Maine, 1972: The 1972 United States Senate election in Maine was held on November 7, 1972.  Incumbent Republican U.S. Senator Margaret Chase Smith ran for re-election to a fifth term, but was defeated by Democrat William Hathaway.

United States Senate election in New Mexico, 1972: The 1972 United States Senate election in New Mexico took place on November 7, 1972.  Incumbent Democratic U.S. Senator Clinton Presba Anderson did not run for re-election.  Republican Pete Domenici defeated Democrat Jack Daniels to win the open seat.

United States Senate election in Illinois, 1972: The 1972 United States Senate election in Illinois took place on November 6, 1972.  Incumbent Republican United States Senator Charles H. Percy sought re-election to the United States Senate.  Percy was opposed by Democratic nominee Roman Pucinski, a United States Congressman from Illinois's 11th congressional district, whom he was able to defeat handily to win a second term.

Supporting paragraphs: United States Senate election in Maine, 1972 Margaret Chase Smith
Answer: 1897