By Tim Reid MONTEREY PARK, Calif. (Reuters) – Since she was a little girl, Li Xia’s dream was to move from China and settle in America. On Saturday night, when she heard the gunfire that killed at least 10 people in her newfound home of Monterey Park, California, that dream was shattered. “In my heart, I always felt the United States was the best country in the world,” Xia, 50, said, just four months after leaving her home in Shenzhen Province to settle in the quiet enclave of Monterey Park close to Los Angeles. “Now, I am so sad. I can’t believe it. I don’t want to stay here one more day. I d…