It is a dark chapter in US history - the internment of more than 100,000 Japanese-Americans after Japan's attack on Pearl Harbor during World War Two. 

For four years, they lived in remote camps with substandard housing, poor nutrition, and little access to health care.

Their only contact with the outside world came in the form of letters written to relatives and friends. 

Some of those letters have been uncovered for the first time.

Al Jazeera's Kimberly Halkett reports from Washington. 

Source: Al Jazeera