Cambridge IGCSE and O Level History Option B: The 20th Century, 3rd Edition- The book covers Core Content Option B 'The 20th century: International Relations since 1919' and selected depth studies: Germany, 1918-45; Russia, 1905-41; The USA, 1919-41. This Student book helps to develop content knowledge and deepen understanding. Focus Tasks help build analytical skills and Focus On sections provide support with tackling questions and consolidating learning