Conversation so far:
When was the Whitney Museum of American Art created?
The Whitney Museum was founded in 1930.
Who was Whitney Museum named after?
Named after the museum's founder, Gertrude Vanderbilt Whitney.
Who was Whitney Gertrude?
Gertrude Vanderbilt Whitney was a well-regarded sculptor as well as a serious art collector.
How did the Whitney Museum of American Art begin?
In 1929, Whitney offered to donate over 500 works of American art to the Metropolitan Museum of Art, but the museum declined the gift.
What did Gertrude Vanderbilt Whitney do when she was declined by Metropolitan Museum of Art when offering to donate over 500 works of Ameircan Art?
This, along with the apparent preference for European modernism at the recently opened Museum of Modern Art, led Whitney to start her own museum, exclusively for American art, in 1929.
What did Gertrude Vanderbilt Whitney name the museum started on her own exclusively for American art, in 1929?
Whitney named the it the Museum of Modern Art.

Question: What art work was displayed there?
Self-contained rewrite: What art work was displayed at the Whitney Museum of American Art?