When was construction on Mount Rushmore complete?
1941
1927
1927
1927
1927
1927
1927
1927
1927
1931
1932
1927
1931
1932
1927
1939
1931
1932
1927
1939
1931
1932
1927
1939
1931
1932
1927
1939
1931
1932
1927
1939
1931
1921
1932
1927
1939
1931
1921
1932
1927
1941
1927.
1939
1926
21st century
1931
1921
1932
1941
1927
1923
1939
1926
1941
1931
1927-1984
1921
1932
1927
1923
1941
1939
1927.
1926
1931
1921
1932
1940
1927
1924
1941
1927-1984
1923
1939
1926
1931
1940
1921
1932
1941
1915
1927.
1927
1924
1927-1938
1923
1939
1940
1926
1941
1931
1927-1981
1927-1984
1921
1932
1915
1924
1940
1927-32
1927-1976
1923
1941
1939
1936
1927.
1926
1931
1927-1938
1921
1932
1915
1940
1922
1924
1941
1927-1981
1927-1984
1936
1932.
1923
1939
1926
1907
1927.
1931
1940
1927-32
1921
1932
1941
1915
1936
1924
20th century
1927-1938
1923
1927,
1939
1940
1922
1931.
1926
1941
1931
1927-1981
1927-1984
1936
1939.
1927.
1921
1932
1915
1924
1907
1940
1927-32
1923
1941
1939
1936
1927,
1932.
1926
1931
1927-1938
1921
1932
1927.
1915
1940
1922
1924
21st Century
1941
1927-1981
1927-1984
1936
1927 -
1923
1939
1926
1907
1927,
1931
1940
1921
1932
1941
1936
1922
1932.
1924
1927-1938
February 22, 1941
1923
1927.
1915
1927 -
1939
1940