When did construction begin on the Gateway Arch?
1963
1931
1931
1931
1931
1931
1931
1931
1931
1926
1931
1926
1931
1922
1926
1931
1922
1927
1926
1956
1921
1931
1922
1927
1939
1924
1926
1956
1921
1931
1922
1956
1927
1939
1924
1926
1962
1931.
1956
1921
1959
1931
1923
1922
1962
1927
1939
1924
1960
1926
1932
1956
1959
1921
1962
1931
1923
1922
1960
1904
1927
1939
1924
1926
1956
1959
1932
1962
1960
1921
1931
1923
1957
1922
1956
1959
1904
1954
1927
1939
1924
1926
1962
1931.
1932
1955
1960
1957
1956
1921
1959
1931
1923
1954
1922.
1926.
1922
1962
1904
1927
1939
1955
1924
1923.
1960
1926
1932
1957
1963
1956
1959
1954
1921
1962
1931
1923
1955
1922
1960
1904
1927
1921.
1939
1957
1924
1963
1926
1956
1959
1954
1932
1962
1931.
1955
1960
1964
1965
1921
1931
1923
1960s
1957
1963
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1956
1959
1927.
1954
1927
1939
1924
1926
1962
1932
1955
1960
1964
1965
1902
1957
1963
1956
1921
1959
1931
1961
1923
1954
1922.
1951
1926.
1922
1962
1904
1927
1939
1955
1924
1923.
1960
1964
1926
1965
1932
1957
1963
1931.
1956
1959
1961
1954
1951
1921
1962
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1960s
1955
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1960
1964
1965