Which nation first colonized most of the western United States?

• A. Spain
• B. France
• C. Great Britain
• D. The United States

Answer: (A)

The main idea here is understanding which European power established the earliest widespread presence across the western part of what is now the United States. Spain was that power, building a broad network of missions, presidios, and settlements across the Southwest and California. Through these missions and towns—think of San Diego, Mission Santa Barbara, San Francisco, Santa Fe and other frontier outposts—Spain extended its control far into what would become the western U.S. This Spanish frontier remained in place for centuries, shaping culture, place names, and land use long before the United States expanded westward or Britain and France held other regions of North America.

France did have influence farther north and along parts of the interior (like Louisiana), and Britain controlled areas along the Pacific Northwest later, but neither dominated the western territories to the extent Spain did. The United States expanded westward later, after independence and through acquisitions and treaties, not as the first colonizer of the western region. So, Spain is the nation that first colonized most of the western United States.