It's like with russian gas once again, even the root of the problem is the same. One man with infinite power and no accountability for his actions.
Just for clarification. I don't blame Americans, but at least from my perspective, this electoral system is very radical and gives almost "absolute power" to a person or party that almost always has marginally more support. You do not need to compromise by creating coalitions etc.
In the end, it is the fault of us Europeans who blindly believed that any successful candidate would be in our favour and perceived as friendly. Although everyone understands how fragile elections are, this was naively ignored.
Canadians are taking Trump's threats very seriously, as is Greenland, as is Panama, as is the EU. And for good reason.
And the history of NSA spying on the whole world, see PRISM.