Explain Like I'm 5 (ELI5)

I mean, there is a variety of intriguing political parties, but it's still always "Republicans or Democrats". Why?

(Disclosure: I'm German, never been to the US.)

I'd expect the state to have a list of all its citizens and their basic personal info (age) which could be used to determine their eligibility for voting. In my country, we get a "invitation" to the vote, with your voter station and info on how to change it.

Instead, I'm seeing posts about USA's "voter rolls", which are sometimes purged, which prevents people from voting. Isn't this an attack on the voting system and democracy itself?

So why doesn't USA have a list of voters? Are they stupid?

If brown is actually a darker shade of orange (Wikipedia), then how do we get light brown and not orange?

How is it possible to be light and a "darker shade" at the same time?

When I was in school we were taught genocide is a crime against humanity, now the USA and other countries act like Israel has blackmail material on all their leaders. What causes so many countries to be supporting them like this?

I’ve properly missed out with this one and haven’t got a clue what is going on, beyond Sony aren’t letting some countries residents create accounts.