Does that museum receive any money from the Rothschild family? If so then it could be at least a little true because the Rothschilds did make a great deal of wealth at least indirectly from the Black Slave Trade.
"...From 4,000 miles away the Rothschilds kept their European [Jewish] hands deep in the Southern cotton economy by way of agents they hired to do their bidding.
As the network of loans and crop liens developed throughout the South, the source of the cascading credit lines reached past Philadelphia and New York to the major banking houses of London, especially the House of Rothschild..."
Source:
The Secret Relationship Between Blacks and Jews Volume 2, page 328