What was Executive Order 9066?
Executive order 9066 was the order that gave power to the military of the U.S.A. to relocate any citizen of Japanese ancestry from the west coast or any military area. It was the official start of the Japanese-American Internment Camps.

How did it work?
Roosevelt’s Executive Order 9066, dated February 19, 1942, gave the military powers to ban any citizen from a fifty to sixty-mile-wide coastal area stretching from Washington state to California and extending into southern Arizona. The order also authorized transporting these citizens to assembly centers quickly set up and governed by the military in California, Arizona, Washington state, and Oregon.
General Dewitt came up with the idea to relocate Japanese-American citizens

Who was part of it?
The person who created the idea of the Japanese Internment Camps was Lt. Gen. John L. Dewitt and through pressing of the congress, they got President Franklin Roosevelt to sign Executive Order 9066 which gave the military the power to put any citizens of Japanese ancestry in internment camps away from military area.
President Roosevelt is signing the Executive Order 9066 which officially started the Internment camps.

What was the argument for and against the program?
People who were for it said it was necessary because the Japanese were a threat to the U.S.A. Some people believed that anybody of Japanese ancestry was a spy and they were talking to the Japanese and plotting attacks on the U.S.A. There theory was if the Japanese wanted to prove their loyalty, they had to go to the camps. People who were against thought it was unconstitutional and most of the Japanese were born in America and were loyal to America.

What's the JIC Program?
The JIC program was the program that created the actual internment camps. They designed the barracks and camps. They built them very quickly and as a result, the barracks were not able to be accustomed to the harsh conditions of the location they were set in. Many Japanese had to make their barracks more weather bearable by themselves.