On the top of hill

At the university,
I can see sweat and hard work in those sweet smiles:
Chinese, Mexicans, Europeans
African, Central and South American immigrants
Their kids laugh on the top of hill
What to do with this alien wisdom they've carried?
Or, would America be only a blender
melting all colors in tasteless hamburgers?
It should be the diversity that changes
urban areas in a interesting kind of human forests