As the United States marks the 250th anniversary of its founding, it confronts a new world order dominated by its relationship with China. In this wide-ranging series, we examine the pressure points and possibilities in those ties, from hard tech to soft power. Here, Lucy Quaggin looks at how Gen Z Chinese-Americans are navigating identity amid shifting US-China tensions. As a high school student on New York City’s Upper East Side, Chinese-American Hannah Liu would take the subway downtown on...