Vocabulary
peak The top of a mountain
canal a ditch dug across land that often connects two waterways
skyscraper a very tall building
Declaration of Independence document declaring the United States free from Great Britain
mill a factory in which people make products out of raw materials
American Revolution the war in which the American colonies won independence from Great Britain
lock a water elevator used to raise and lower boats
Mass production a way of making large quantities of products
United States Constitution the plan of government for the United States