Terrorism. Immigration. Cyber security. Border control. In addition to being hot-button issues, these are also the areas of American safety under the purview of the Department of Homeland Security. Whether they're determining the rules of immigration and how we let migrants and refugees into the country, beefing up security along America's borders, fighting cyber attacks from foreign countries, or creating plans to keep terrorists from attacking our citizens, the Department of Homeland Security plays a big role in keeping Americans safe. Introduce your readers to this essential department, the how and why they operate, the way they do, and which of their rules play a part in our everyday life.