There are 8 parties voted in right now.
Late 90s and early 00s the three parties on the left side of the spectrum came together and formed majority. For the 2006 election four other parties joined together in what they called the Alliance.
That created the two blocks. The four parties in the alliance formed a common agenda, even splitting minister posts, while the three parties on the left still had their own party agendas.
The allaince held power from 2006 to 2014 but then lost it.
2014 to 2018 only two of the parties on the left side were actually part of the ruling body.
For the 2018 election the Alliance were a bit out of it. They still often said they were together, but they did not go to the election with a common platform, but all of the four parties wanted to lift from their own strengths.
The 2018 result was difficult since the outsider party (the anti foreigner party) got just under 17.53% of the votes making them the third largest party, but since they are heavily racist, most parties do not want to work with them.
The four parties in the Allaince got 40,26% of the votes and the three parties on the left got 40,67% of the votes, and also had the biggest party called S that had 28.26% of the votes.
The Alliance proclaimed themselves as the winners, and told the other parties that even if they did not have their own majority, the other parties still had to agree with what they wanted.
Now of course the three parties on the left said that it would be odd since if they joined up, they would be bigger than the Alliance.
The biggest party in the Alliance, M, and the Christian Democrats then said that if they do not give them the power, they will get support from the racist party. The Alliance had cracks before, but that is when the other two parties in the Alliance decided that they needed to hold talks with S.
The talks crashed several times. The goal was to try and avoid giving the racist party any actual power, and after a few months now they came to a temporary agreement. A new election was close, Two parties from the Alliance and two parties from the left side have agreed to lead Sweden for four years. None of the parties are very happy with the solution, but I think they felt that an odd goverment is better than no goverment.
I think it is one of those situations where they had to take responsibility and focus on what is best for Sweden in the long run. The goverment will probably not be that strong, and a lot of the changes they make will not last for a long time after the next election, but it will ensure that Sweden will stand strong during this testing time.
The block politics that Sweden have had since the Alliance formed worked at first, but in the long run it is not healthy for the political climate as it limits choices.