<span> the 15th president </span><span>James Buchanan
</span>
Answer:
D.
Explanation:
because it is a series of asking and answering questions :)
hope this helps
Harriet Tubman changed<span> the world by escaping from slavery, becoming an abolitionist and helping many slaves attain their freedom by means of the Underground Railroad, a secret network of routes and safe houses to aid runaway slaves.
Got that from Goggle.</span>