When was Mount Rushmore declared a completed project?
15280
1889
1889
1908
1886
1890
1889
1905
1908
1886
1890
1907
1904
1876
1889
1905
1908
1886
1883
1890
1907
1904
1889
1905
1876
1908
1886
1884
1883
1890
1913
1889
1907
1904
1905
1924
1885
1876
1908
1860
1886
1890
1884
1889
1883
1903
1913
1880
1908
1860
1886
1890
1896
1907
1887
1904
1895
1891
1889
1905
1924
1885
1876
1908
1921
1886
1884
1890
1889
1883
1909
1903
1913
1896
1907
1887
1880
1904
1895
1891
1902
1893
1869
1915
1905
1924
1889
1885
1876
1908
1921
1886
1884
1872
1890
1889
1883
1909
1903
1913
1875
1896
1880
1907
1887
1904
1892
1895
1891
1902
1926
1893
1869
1915
1905
1924
1894
1885
1876
1908
1921
1879
1886
1884
1889
1872
1883
1890
1909
1903
1912
1913
1875
1896
1907
1887
1904
1892
1895
1880
1891
1902
1926
1881
1871
1893
1869
1915
1905
1924
1894
1885
1927
1876
1908
1921
1888
1870
1968
1916
1910
1879
1886
1884
1936
1889
1872
1883
1923
1890
1909
1903
1935
1970
1933
1969
1960
1912
1897
1913
1968
1875
1920
1925
1896
1907
1916
1887
1892
1880
1910
1936
1935
1914
1973
1970
1933
1972
1904
1895
1891