The presentation of the election overseas has been one that only took into account national polling results and not state results. Considering hyper-polarization, it was always going to be "close".
The thing with US general elections is that the president is decided whenever they can reach 270 electoral votes. Both Republican and Democratic Parties have a certain amount of electroal votes already locked up...you're not going to expect Alabama to turn blue nor are you going to expect New York to turn red either. Huge upsets can happen, like some people thinking Clinton could win Arizona, but its very unlikely to be honest.
With that taken into account, what really matters are the swing states. This link is a good resource detailing the states in play and what either candidate has to do to win. The main swing states in question are Nevada, Iowa, Ohio, Florida, and North Carolina.
To put it simply, Trump needs to win literally every swing state and take control of a pretty safe Clinton state like Pennsylvania. If Clinton win Florida, Trump is essentially screwed. If Trump can't win a safe Clinton state, he still loses. So Trump winning is actually pretty unlikely to happen, especially when Trump is toast in Nevada and not looking too good in Florida.
There's only like two days until the election so there's not much point talking about it but that's why people are pretty positive that a Clinton victory is going to occur.
