<page_title> Abolition of monarchy </page_title> <section_title> Monarchies abolished in the 20th–21st centuries </section_title> <table> <cell> 1975 <col_header> Year </col_header> <col_header> 1900s </col_header> <col_header> 1910s </col_header> <col_header> 1920s </col_header> <col_header> 1930s </col_header> <col_header> 1940s </col_header> <col_header> 1950s </col_header> <col_header> 1960s </col_header> <col_header> 1970s </col_header> </cell> <cell> Sikkim <col_header> Country </col_header> <col_header> 1900s </col_header> <col_header> 1910s </col_header> <col_header> 1920s </col_header> <col_header> 1930s </col_header> <col_header> 1940s </col_header> <col_header> 1950s </col_header> <col_header> 1960s </col_header> <col_header> 1970s </col_header> </cell> <cell> Palden Thondup Namgyal <col_header> Last monarch </col_header> <col_header> 1900s </col_header> <col_header> 1910s </col_header> <col_header> 1920s </col_header> <col_header> 1930s </col_header> <col_header> 1940s </col_header> <col_header> 1950s </col_header> <col_header> 1960s </col_header> <col_header> 1970s </col_header> </cell> <cell> Referendum; official result: 97% to become a state of India. <col_header> Year </col_header> <col_header> 1900s </col_header> <col_header> 1910s </col_header> <col_header> 1920s </col_header> <col_header> 1930s </col_header> <col_header> 1940s </col_header> <col_header> 1950s </col_header> <col_header> 1960s </col_header> <col_header> 1970s </col_header> </cell> </table>
King Palden Thondup Namgyal of Sikkim lost his throne in 1975 when the country became a state of India following a referendum.