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, Khushboo Razdan looks at how books shape public perceptions and inspire lifelong connections between the US and China even as their geopolitical rivalry intensifies. Alexander Boyd was 14 when a book about China altered the…