Why has Japan never experienced a strong rural-to-urban shift in its population?

While agriculture was always important, Japan always existed as a semiurban community because the mountainous terrain forced most of the population to live along the country's coasts. Without a large rural population to begin with, Japan never really experienced the rural-to-urban shift common in the rest of the world.

Explanation:

because its important to learn about other countries and how high tech they are compared to us. also its good to learn about other cultures and how ours differs and in common also we need to learn about companies that we still buy since they ship it here.