Final answer:
The main idea of 'Lies My Teacher Told Me' is to challenge the commonly taught historical narratives and myths, and encourage critical analysis of the past.
Step-by-step explanation:
The main idea of Lies My Teacher Told Me is to challenge and question the commonly taught historical narratives and myths that are often presented in textbooks. The author, James W. Loewen, examines the historical inaccuracies, biases, and omissions that are perpetuated in American history education. He argues that it is important for students to critically analyze and seek the truth behind historical events to have a more accurate understanding of the past.