PYONGYANG, North Korea — North Korean leader Kim Jong Un said Saturday the second flight test of an intercontinental ballistic missile demonstrated his country can hit the U.S. mainland, hours after the launch left analysts concluding that a wide swath of the United States, including San Francisco, Los Angeles, Denver and Chicago, is now in range of North Korean weapons. The Korean Central News Agency said that Kim expressed “great satisfaction” after the Hwasong-14 missile, which the country first launched on July 4, reached a maximum height of 2,314 miles and traveled 620 miles from the launch point before landing in waters near Japan.