対華21カ条要求
Beginning in the early 1900s, hundreds of thousands of Koreans migrated to Manchuria. Though this territory was not under Japanese control, the Japanese government claimed Koreans in Chinese territory as Japanese nationals. This contention was part a broader effort to dominate China (see Twenty-One Demands). It meant that Japanese consulates claimed extraterritoriality privileges for Koreans in China and that Koreans were prohibited from naturalizing as Chinese citizens. After the Mukden Incident and the establishment of Manchukuo, Japanese authorities encouraged further Korean migration to Manchuria. The nationality status of Koreans in Manchuria was ambiguous.