another poetry question for poetry lovers!?!?

[jubey jubes]

ya so I LOVE the poem I TOO SING AMERICA BY LANGSTON HUGUES but ive always wondered what exactly it means
i dont understand what the I TOO SING AMERICA PART is about
but anyways heres the poem
I Too Sing America

I, too, sing America.

I am the darker brother.
They send me to eat in the kitchen
when company comes,
but I laugh,
and eat well,
and grow strong.

Tomorrow,
I’ll be at the table
when company comes.
nobody'll dare
say to me,
"eat in the kitchen"
then.

Besides,
they'll see how beautiful I am
and be ashamed--

I, too, am America