How is China expanding so quickly? 

Everyone is aware of how china has been expanding. In fact, its all over the news. However, what the news doesn't show, is how quickly they are doing so.
America has enjoyed its status as the lone superpower for close to 3 decades, however, China's GDP, military, navy, production output, and mass development has put it up there with the US. They continuously spend to bolster their military, while also asserting themselves on their immediate neighbors. In fact, they have the most border disputes out of any other country in the world.
They just happened to surpass the US in terms of PPP GDP, which is scary. This video delves into how China has managed to expand so quickly.