Final answer:
Countries exempt from the quota system and allowed to come to the US unrestricted were primarily those in the Western Hemisphere, including Mexico and other Latin American nations.
Step-by-step explanation:
The countries that were exempt from the quota system and allowed to come to the US unrestricted were those in the Western Hemisphere, primarily Mexico and other Latin American nations. The US government permitted immigration from these countries as part of its commitment to stewardship of the Western Hemisphere. This was a political compromise demanded by congressmen who represented industry and agribusiness in the Southwest.