The 20th century started on the 1st of January 1901, so that was obviously before 1909. However, it did not finish until the 31st of December 2000, by which time 1909 had long finished.
1909 was in the 20th century.
From 1901 to 2001, this century was called the Twentieth century. This is because the first century did not begin in the year of Zero. It began at the year of one. Thus the first century ended on January 1, the century of one.
100 years ago is 1909, therefore it is the 20th century.
The first decade in a century is called the "2020s" for the years 2020 to 2029 in the 21st century. Similarly, for the 20th century, the first decade was the "1900s," covering the years 1900 to 1909. Each decade is typically referred to by the first year of that decade.
It started in 1909/1910 - the early 20th century, and is still going on today.
Futurism started in Italy in the early 20th century.
The 20th century
20th
When the 19th century finished. In 1901.
1999 is in the 20th Century. The first year of the 21st century is 2001.
It first appeared in the 20th century
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