The Main Reason for the Lack of Invasion During the Koryo

question 80

Multiple Choice

The main reason for the lack of invasion during the Koryo Dynasty ​was

• A)​Mongol invasion of China
• B)​lack of a strong political dynasty in China
• C)​political alliance with Japan
• D)​using Manchuria as a buffer zone
• E)​superior military strength with an enormous cavalry