Answer and explanation

Correct answer: D. A secret network of routes and safe houses used to escape north

  1. Step 1: The Underground Railroad was an organized network of secret routes and safe houses for fugitive slaves to escape to the abolitionist Northern United States and Eastern Canada during the era of slavery in the United States. Answer: A secret network of routes and safe houses used to escape north. Why not the others: None of these fit: A trade route used by merchants to carry goods to the Pacific coast; An early subway system built beneath the streets of New York City; A railroad built by the Union Army to move troops in the Civil War.

Practise more Colonial America to the Civil War.

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