It's not just 'having money', it's 'having a huge amount of money in foreign assets'. One entity controlling that much capital is able to manipulate the global

It's not just 'having money', it's 'having a huge amount of money in foreign assets'. One entity controlling that much capital is able to manipulate the global economy in some interesting ways. For example, they could strategically pump or dump other countries' currencies, and probably even crash most other countries' economies at will. This is naturally pretty scary to other competing entities that historically are used to being the ones doing the controlling.