Westward ho! If you travel across certain parts of the United States, you can still see wagon wheel ruts where people crossed the west in search of more opportunity and better lives more than 200 years ago! The Oregon Trail: The Journey Across the Country from Lewis and Clark to the Transcontinental Railroad offers readers ages 9 to 12 a fascinating look at the explorers and settlers who traveled this route during the westward expansion of the United States. When America received its independence in 1776, the new country was made up of 13 colonies that became the United States of America. European immigrants continued to arrive in the new country, eager to make new lives for themselves and their families. By 1803, there were 17 states and a need for even more space. The United States doubled its land area with the Louisiana Purchase in 1803. President Thomas Jefferson commissioned the Corps of Discovery to explore and map a territory that had only been seen by fur trappers and the Native Americans who lived there. The expedition into the American west, more popularly known as the Lewis and Clark expedition, left from Independence, Missouri for more than two years of exploration that produced a route for American settlers to take. The route was the Oregon Trail, also known as the Oregon and California Trail. In The Oregon Trail: The Journey Across the Country from Lewis and Clark to the Transcontinental Railroad, readers ages 9 to 12 can delve into the explorations of Meriwether Lewis and William Clark and other explorers. They can learn about the more than half a million people who followed during the nineteenth century. What challenges did these pioneers face on the 2,170-mile journey? How were Native American tribes and nations affected by this mass migration? Primary sources allow readers to feel like a part of the Oregon Trail experience while biographical sidebars will introduce the compelling people who were part of this time in U.S. history. Investigative, hands-on projects and critical thinking activities such as writing a treaty and researching artistic impressions of the Oregon Trail invite readers to further their understanding of life on the trail, early towns and forts, and the Transcontinental Railroad that followed the wagons into new lands and territories that would eventually become states.