To a large extent, this reflects its unbroken experience of more than four centuries of hospitality to foreigners Chinese, Portuguese, and Dutch during a period in Japanese history when the country was characterized by often murderous xenophobia.
It's xenophobia can be seen and studied today, though little of it remains in the culture. 
mnli hypothesis: It's xenophobia can be seen and studied today, though little of it remains in the culture.  premise: To a large extent, this reflects its unbroken experience of more than four centuries of hospitality to foreigners Chinese, Portuguese, and Dutch during a period in Japanese history when the country was characterized by often murderous xenophobia.