When was construction on Mount Rushmore complete?
1941
1889
1890
1889
1886
1880
1876
1890
1889
1886
1880
1883
1884
1885
1876
1869
1890
1879
1889
1886
1880
1883
1884
1885
1887
1908
1876
1890
1889
1886
1880
1883
1881
1869
1896
1872
1876
1890
1884
1879
1885
1907
1887
1889
1886
1880
1908
1891
1876
1870
1883
1881
1890
1889
1886
1880
1869
1905
1896
1872
1884
1879
1890
1885
1907
1887
1889
1908
1873
1886
1860
1871
1880
1891
1876
1870
1883
1875
1881
1869
1905
1889
1860
1904
1896
1872
1890
1884
1879
1885
1887
1880
1907
1889
1908
1895
1873
1886
1860
1871
1891
1894
1876
1893
1870
1883
1892
1875
1878
1868
1881
1869
1860
1888
1905
1904
1896
1872
1890
1884
1879
1885
1907
1887
1889
1908
1895
1873
1886
1871
1891
1880
1894
1876
1893
1870
1883
1892
1875
1878
1881
1868
1869
1913
1888
1905
1904
1896
1877
1890
1880s
1872
1884
1879
1885
1874
1907
1887
1889
1895
1880
1908
1873
1886
1871
1891
1894
1876
1893
1870
1883
1880s
1892
1875
1878
1868
1882
1881
1869
1913
1888
1905
1904
1896
1903
1877
1872
1890
1884
1880s
1879
1885
1874
1907
1887
1889
1895
1873
1886
1880
1886.