In this task, you will be shown an extract from a movie plot. You need to read the extract and create questions that can be answered from the extract. The questions should be well-formed and grammatically correct. The questions should be completely answerable from the given passage and should not require any external knowledge. Subjective questions are not allowed. Create questions that result in factoid answers. A simple rule of thumb to decide whether a question is factoid or not is to see if two different people with average reading/comprehension skills would come up with the same answer after reading the passage.
Q: The first half of the film begins before the Civil War, explaining the introduction of slavery to America before jumping into battle. Two families, the northern Stonemans and the Southern Camerons, are introduced. The story is told through these two families and often their servants, epitomizing the worst racial stereotypes. As the nation is torn apart by war, the slaves and their abolitionist supporters are seen as the destructive force behind it all.The film's racism grows even worse in its second half, set during Reconstruction and featuring the rise of the Ku Klux Klan, introduced as the picture's would-be heroes. The fact that Griffith jammed a love story in the midst of his recreated race war is absolutely audacious. It's thrilling and disturbing, often at the same time.
A:
Through what two families and their servants is The Birth of a Nation told?