The same way that it is called nowadays.
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No, the years from 1800-1899 is the 19th century. The eighteen century is from 1700-1799.
1865 is in the seventh decade of the 19th century.
The 19th century.
The 19th 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.