Their award-winning "Negro Exhibition" debuted in Paris, France, in 1900. It featured 500 photos of African American communities, successful black businesses and schools, as well as books and pamphlets by African American authors. (It has also been on display at the Library of Congress.) African Americans had a long history of going to Paris as a refuge from American racism, so it's not surprising that Du Bois and his colleagues decided to open the exhibit there.
In the exhibit, Du Bois showed that African Americans, in the 35 years since the Civil War, had come an amazing distance since being an enslaved people. A majority of African Americans were able to read, they owned one million acres of land and paid taxes on $12 million worth of property.