which countries were not colonized by european powers?
['Nepal.', 'Afghanistan. ... ', 'China. ... ', 'Thailand. ... ', 'Korea. ... ', 'Japan. Japan was also able to resist European colonization. ... ', 'Iran. Both British and Russian forces were interested in controlling present-day Iran (then the Persian Empire). ... ', 'Saudi Arabia. Saudi Arabia has been primarily ruled by tribal leaders from throughout the region. ... ']