Perception of what state?
To cause a liberal revolution in Libson in1820.
Answer:
Either the first or the last one
Explanation:
There are numerous mountains in Japan and they were an obstacle towards unifying the country. Since many parts of Japan waged wars against others, it was difficult to fight in other people's regions since they had the mountains to their advantage so there was a difficulty in uniting every part of Japan through wars, like it was done in numerous other countries.