History textbooks commonly use a timeline for this—a chronological chart that shows when various events happened.

Follow this timeline to chart the evolution of the park system, and the history of the parks. The information in this timeline was gathered in 2009. Explore historical images of the national parks ...

A line graph is used to spot trends in data over time. In order to produce a line graph, data is required. The data often comes in the form of a table. A student recorded how much time they spent ...

Follow this timeline to chart the key events and figures. Nearly 50 million men would register for the draft during WWII. Before Pearl Harbor, the US military had been totally unprepared for a ...