Why did korea choose to isolate itself in the 1500's?

By the end of the 1800s, there was a change in the nature of the immigrants coming to the united states. immigration from northern europe—england, ireland, germany, and scandinavia—declined, while immigration from italy, russia, and austria-hungary grew. in fact, between 1900 and 1910, more than three-fourths of all immigrants came from these three countries. unfortunately, these countries were far removed england, the home of our founders, and the immigrants who came from them had a hard time adjusting to life in their new country.

What former head of the cuban secret service was charged with protecting the country's prime minister for nearly 50 years?

Plz the 10 places that charles darwin stopped at to report his findings, and include dates?