Description

During the Revolutionary War, communication was limited to written correspondence that needed to be physically carried from point A to point B. Since hand-written messages were easy to intercept, spies developed a technique for invisible messages. In addition, messengers would need to be well versed in the physical geography of the region in order to deliver the secret messages in a timely manner. In this lesson, students learn how to use maps to measure the distance and time between points in Colonial America. They also learn how science enabled spies to create a chemical reaction used to write invisible messages. This lesson has adaptations for diverse learners (ELLs).