Well no, it's not obvious why the word nigger is offensive, apparently.

people look to the word nigger for its origins and early usage in the US as a reason to say it's not offensive, but it is only offensive because of modern day people using it to associate all dark skinned peoples that are not of "Caucasian" or light-skinned descent with not just slavery, but an overall lack of everything in a light-skinned person's comparison.

It has been this way only since a quarter way through the 1900's, and continues to this day with people who consider their white skin to be superior throwing the word in dark skin people's faces.

When in reality it means Black in Latin and deviations of the word only appeared when people felt a significance to their certain time/area. A lot of general ethnocentrism surrounds the word also, as some people in history have preferred one deviation of the word over another because of where one word came from, such as the Spanish or French deviation of the Latin word versus the strict Latin deviation.

This is why the word is racist, so if you're going to call a dark skinned person a nigger, you could be considered racist by people who might assume such a thing, but if you're openly referring to a person's skin color, in modern times, you should always say "black", because we are not Latin nor do we use their language unless it is as a reason to describe origins.

Negroes of America thus would be acceptable,

but it's just overall easier to say Blacks of America.

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