Book excerpt: Cambridge IGCSE® and O Level History Second edition for Option B: the 20th Century of the syllabus (0470,2147), updated for the revised syllabus for first examination from 2020 and now supporting O Level as well. Help your students take an enquiry-led approach to historical learning with Cambridge IGCSE® and O Level History. Full of activities and primary and secondary sources, this resource encourages the application of historical skills and enables investigative questioning of cause and consequence. Endorsed by Cambridge Assessment International Education for Option B, the coursebook is written by a team of experienced teachers and provides comprehensive coverage of all of the Key Questions and four of the Depth Studies for syllabus Option B: the 20th Century. Sample answers to a selection of the exam-style questions can be found in the teacher's resource.