Answer:It is made up of four main islands and thousands of smaller ones. The terrain is mountainous, which means there is not a lot of good land for farming. Because of the geography, the Japanese relied on the sea for many aspects of daily life. Trade with China and Korea became important to get the resources they needed.
Explanation: google
I would use two sources of data for income and two for literacy. For average income I would consult the censuses if they were available at that time. In particular I would check the differences between the years 1800 and 1850. Also I would check employment records for the same trades/professions for the two years. For literacy, I would check the school records to see if there was an increase in youth completing high school and also check the university records to see how many graduates there were in the two years.
Neil Armstrong was the first person to step on the moon
I'm gonna do some more research then i'll get back to you on this.