Why are black people referred to as "colored people"?

Why are black people referred to as colored people?

When I born, I black.
When I grow up, I black.
When I go in sun, I black.
When I scared, I black.
When I sick, I black.
And when I die, I still black.

And you white people.
When you born, you pink.
When you grow up, you white.
When you go in sun, you red.
When you cold, you blue.
When you scared, you yellow.
When you sick, you green
And when you die, you grey...

And you calling me colored?

(Written by an African child and nominated by The United Nations as the best Poem of 2006)

Why are black people referred to as "colored people"?
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