The n-word originated in the eighteenth century, and it was used as a derogatory slur against African American slaves. The slave masters called their slaves the n-word. Black people reclaimed this word as their own and use it (the n-word without the hard er ending) as a way to address their friends. By using it in this manner, they're taking away the power it has over them as a slur. Also, there is no equivalent of the n-word for White people. No word could give White people the same history of enslavement or trauma that Black people endured back then.
I think it is the first one (shoppers find sushi...). Cultural diffusion refers to the spread of different cultures around the world. Finding Asian food in America definitely shows an example of cultural spread.
