Learn about Sacajawea, the young Native American girl who guided Lewis and Clark on their historic expedition. Now available in Step into Reading, the premier leveled reader line. More than 200 years ago, explorers went on a cross-country expedition to the Pacific Ocean. Only with the help of a young girl from the Shoshone tribe was the trip was a success. Her name was Sacajawea, and she did this all with her baby strapped to her back. A remarkable History Reader for newly independent readers who read simple sentences with confidence. Step 4 Readers use challenging vocabulary and short paragraphs to tell exciting stories.