I thought I chose a field where they couldn’t sack me
Kanye thought that in the rap game, of all career choices, he wouldn’t find criticism due to it being a predominantly black genre.
Kanye uses a football metaphor to get this across, with field referring to a football field and a sack being the criticism he’s received over the course of his career (especially after Taylor-gate)
Field also refers to a career or profession, in this case rap music, while sack is a common euphamism for being fired from said position. ‘Ye believed he could not be removed from the rap game only to find how fickle public opinion can be.
Seeing as racism is Kanye’s focus throughout the song, field may also be a double entendre in which field stands for both an area of work as well as where slaves toiled. Kanye is trying to escape those slave fields, but by recognizing that he nonetheless did choose a field, he is admitting that in some ways he’s still playing their game.
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