Good . But what about europeans traveling to America and then coming back ?
It's pretty difficult, legally speaking, for most countries to deny entry to their own citizens. So EU citizens coming back to the EU from the US will be allowed in. Exactly how that will work will depend on the country's own procedures for mitigating the spread of the virus but is likely to include at least a period of self-isolation in an address which is provided to local authorities.
This is kind of an academic question for now, though, since Europeans mostly can't get to the USA due to the USA's own travel ban and the small number of flights in operation. So the number of EU citizens in the USA who need to come back will be tiny.
I suppose Brazil is banned as well ?
Yes. The list will seemingly be based on the number of people infected in the past 14 days, per capita, for each country. If that country is doing notably worse on average than the EU, they'll be on the ban list.
Brazil will definitely be on the list of countries with higher infection rates than the EU, as will most of the rest of South America.
I can't read the article, do they talk about how long this ban is for even in terms of the *minimum length* it could last for?
There was a similar story earlier in the week quoting EU sources and the suggestion then was that the list would be reviewed every 14 days. That means there's a chance that the ban could be lifted fairly quickly, but it would depend on how quickly the USA got fortnightly infection numbers down to approximately EU-like levels per capita. So the length of the ban is however long it takes for that to happen.
As an American, would I be able to go to Europe if I go through Canada first?
Even if you get into Canada and get on a flight to Europe, you'll of course need to go through passport control and they'll presumably stop you. I suppose you might be able to get through if you can conclusively prove that you have spent the past two weeks or more in Canada, but for Americans who want to get to Europe, well, I'd probably strongly recommend against the approach of living in Canada for two weeks and then trying their luck with EU border control.