The rivers that are on the 2026 Exam are the Mississippi River, the Colorado River, the Missouri River, the Ohio River, the Hudson River, the Potomac River, the Rio Grande, the Columbia River, the Tennessee River, and the Yukon River. These rivers are chosen for their significance in American history, geography, and environmental impact. The Mississippi River, for instance, is the longest river in the United States and has been a critical transportation artery and a source of fertile soil for agriculture. The Colorado River, on the other hand, is the primary source of water for the southwestern United States and is crucial for the region's agriculture and urban development. The Missouri River and the Ohio River are also major waterways that have shaped the economic and cultural landscape of the United States. The Hudson River and the Potomac River are significant for their role in the early history of New York and Washington, D.C., respectively. The Rio Grande and the Columbia River are important for their roles in the development of the American West. The Tennessee River and the Yukon River are notable for their ecological importance and the indigenous cultures that depend on them. According to the U.S. Geological Survey, these rivers collectively contribute to the livelihoods of millions of Americans and play a vital role in the nation's economy and environment.