IB 历史里的route 1和route2 是什么意思啊？谢谢

IB 历史里的route 1：
Syllabus component
欧洲历史和伊斯兰世界
History of Europe and the Islamic world—prescribed subjects
1. The origins and rise of Islam c500–661
2. The kingdom of Sicily 1130–1302
History of Europe and the Islamic world—topics
1. Dynasties and rulers
2. Society and economy
3. Wars and warfare
4. Intellectual, cultural and artistic developments
5. Religion and the state
HL option
1. Aspects of the history of medieval Europe and the Islamic world
SL/HL internal assessment
Historical investigation
和route2 ：
Syllabus component
20世纪世界历史
20th century world history—prescribed subjects
1. Peacemaking, peacekeeping—international relations 1918–36
2. The Arab–Israeli conflict 1945–79
3. Communism in crisis 1976–89
20th century world history—topics
1. Causes, practices and effects of wars
2. Democratic states—challenges and responses
3. Origins and development of authoritarian and single-party states
4. Nationalist and independence movements in Africa and Asia andpost‑1945 Central and Eastern European states
5. The Cold War
HL options
2. Aspects of the history of Africa
3. Aspects of the history of the Americas
4. Aspects of the history of Asia and Oceania
5. Aspects of the history of Europe and the Middle East
SL/HL internal assessment
Historical investigation