Since America's earliest days, people have come from all over the world to live here, but it isn't easy. Their right to enter the country has been challenged many times, and it is still challenged today. From the early Europeans to modern-day immigrants and refugees, people have fought to enter the United States, and the Constitution has changed over time to meet their needs. It has also challenged them. The argument continues today about immigrants from Muslim countries. Is anyone allowed to come to America, and what does the Constitution really say about immigration? Readers will explore the answers to these questions.