Politics and Money

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Moreover, Charles Dickens and Mark Twain created characters who used the word as contemporary
usage. Twain, in the autobiographic book Life on the Mississippi (1883), used the term within quotes,
indicating reported usage, but used the term "negro" when speaking in his own narrative persona.

In the United Kingdom and the Anglophone world, nigger denoted the dark-skinned (non-white) African and Asian
(i.e., from India or nearby) peoples colonized into the British Empire, and "dark-skinned foreigners" — in general.

By the 1900s, nigger had become a pejorative word.

http://en.wikipedia.org/wiki/Nigger

.. now we know ..