The series timeline includes events in the nineteenth and twentieth centuries.

Nineteenth century[edit | edit source]

Twentieth century[edit | edit source]

1900s[edit | edit source]

1910s[edit | edit source]

1920s[edit | edit source]

1920[edit | edit source]

1921[edit | edit source]

1922[edit | edit source]

1923[edit | edit source]

1924[edit | edit source]

1925:[edit | edit source]

1926:[edit | edit source]

1927:[edit | edit source]

1928:[edit | edit source]

1929:[edit | edit source]

1930s[edit | edit source]

1930:[edit | edit source]

1931[edit | edit source]

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