Two families, abolitionist Northerners the Stonemans and Southern landowners the Camerons, intertwine. When Confederate colonel Ben Cameron is captured in battle, nurse Elsie Stoneman petitions for his pardon. In Reconstruction-era South Carolina, Cameron founds the Ku Klux Klan, battling Elsie's congressman father and his African-American protégé, Silas Lynch.Source: TMDb
Unfortunately, you cannot buy or rent The Birth of a Nation on any of the streaming services in the United States at the moment.
The Birth of a Nation was released 106 years ago in 1915.