In 2014, when China's high-speed rail technology was about to take its first step to the world, however, Mexico unilaterally tore up the 30.5 billion high-speed rail contract signed with China, causing a huge loss to a Chinese company. However, before it, the relationship between China and Mexico has been very good. So, what is going on here? Why did Mexico suddenly revoked the contract? OK, that and more is exactly what we are going to talk about today. Let’s get started!