Where to Test a Nuclear Bomb

The United States detonated three underground nuclear bombs on a far-off Alaskan island called Amchitka in the 1960s and 70s. The goal is to understand what the motive of the United States in selecting Amchitka over the endless potential sites to test at were. What makes a place worthy in being tested on, or unworthy in being left alone. How does the United States deal with resistance from locals and other organizations, fighting to prevent their tests.