What Langston Hughes poem refers to a "raisin in the sun"?

Langston Hughes’ poem “Harlem” (1951) refers to a “raisin in the sun”. Hughes asks:

“What happens to a dream deferred?

Does it dry up like a raisin in the sun?”

How fast does the earth travel around the sun? The earth moves at 66,641 miles per hour around the sun.
How big is the moon? The moon's diameter is 2,160 miles. The earth's diameter at the equator is 7,926.68 miles.
How hot is the sun? At its surface, the sun is about 7,640 degrees Fahrenheit. In other words, very hot. In the sun's interior, temperatures can range above 18 million degrees Fahrenheit.
On what book is The Heiress (1949) based? The Heiress is based on the book Washington Square, by Henry James.
Who won the Cannes Film Festival prize for Best Film in 1968? No one won the Cannes Film Festival prize for Best Film in 1968. Political demonstrations led by directors like Francois Truffaut, Jean-Luc Godard, and Claude Lelouch forced the festival to close in mid-proceedings…
What office did Harvey Milk hold? Harvey Milk (1930-78) was the first openly homosexual candidate to be elected to San Francisco's Board of Supervisors. An advocate of gay rights and urban issues, Milk was elected in 1977, representing the…