What year was the Jefferson Memorial built?
1943
1931
1922
1931
1922
1931
1922
1931
1922
1931
1922
1931
1922
1931
1922
1921
1931
1922
1921
1931
1922
1921
1931
1922
1921
1923
1931
1922
1921
1923
1924
1915
1931
1922
1921
1923
1924
1915
1931
1922
1921
1923
1924
1915
1931
1922
1926
1921
1923
1932
1924
1915
1884
1931
1922
1926
1902
1921
1923
1932
1924
1915
1884
1931
1922
1927
1926
1921
1903
1923
1913
1932
1924
1915
1931
1922
1926
1884
1902
1921
1923
1927
1924
1915
1931
1922
1903
1913
1926
1932
1921
1923
1924
1915
1884
1931
1902
1922
1903
1927
1914
1921
1923
1913
1926
1932
1924
1915
1884
1931
1922
1914
1922.
1902
1921
1903
1923
1927
1913
1914
1924
1915
1926
1932
1939
1884
1921
1923
1914
1922.
1924
1915
1902
1889
1927
1914
1885
1921
1903
1923
1931.
1913
1926
1932
1919
1924
1915
1914
1922.
1939
1884
1921
1889
1923
1919
1914
1924
1915
1922,
1885
1902
1903
1927
1931.
1913
1919
1921
1923
1914
1926
1922.
1932
1939
1924
1884
1889
1922,
1919
1914
1915
1902
1921
1903
1923
1927
1931.
1913
1919
1885
1914
1922,
1926
1922.
1932
1939
1924
1884
1890
1921
1923
1919