That's because everyone including Europeans spend plenty of their time watching the US election dramas so obviously it starts as early as possible because there

That's because everyone including Europeans spend plenty of their time watching the US election dramas so obviously it starts as early as possible because there's strong demand for it. It's a big business for everyone: the politicians, media, tech companies, the long line of hangers on, etc. In Canada we know who the next 2 primary candidates were a year ago and elections not until next yr. That's almost always how it works, whether it's formalized or not.