Final answer:
Textbooks may neglect previous journeys due to a focus on likely exam content, a bias toward written material over oral traditions, and a curriculum emphasis on U.S. history, while also striving for inclusivity and managing text-image balance.
Step-by-step explanation:
One reason textbooks may neglect previous journeys is that they often focus on content that is expected to be on exams, leading to the elimination of material that students might skip, such as lengthy opening vignettes, extended block quotes, and special sections. Additionally, textbooks may reflect biases towards written material over oral traditions and might prioritize content that is more closely aligned with the curriculum requirements, such as focusing on U.S. history over world history to address American students' lack of knowledge in their own country's characteristics, conditions, and cultural processes.
Moreover, the desire to present a more inclusive and accurate perspective can lead to the inclusion of previously neglected information about underrepresented groups and cultures. However, challenges like the balance between text and images must be managed to avoid distracting students from critical reading and fostering more meaningful engagement with the material.