The Ninth Century. The First Century was 1-100, the Second 101-200 and so on. 2000 was the last year of the Twentieth Century and 2001 the first year of the Twenty-first.
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21st century
21st. century
1914 was in the 17th century x
After the internal wars and expansion of the 19th century, US industrialism peaked during World War 2 and expanded to become the dominant economic force in the world.
1611 (AD) was in the 17th century.