Final answer:
Illiterate slaves learned escape routes through oral communication, hidden messages in songs, and knowledge of natural landmarks.
Step-by-step explanation:
Illiterate slaves often relied on oral communication and secrecy to learn escape routes. They would listen to conversations among literate slaves, trusted individuals, or abolitionists who might visit the plantation. Sometimes, songs were used to convey hidden messages about escape routes and safe houses. For example, the song 'Follow the Drinking Gourd' was believed to provide directions to the North. Slaves also used natural landmarks such as rivers, mountains, and the North Star to navigate their way to freedom.
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