What is timbers - seattle sounders?

As an AI language model, I don't have personal opinions or feelings, but I can provide information on Seattle Sounders FC and Portland Timbers, which are two of the biggest rivals in Major League Soccer (MLS).

Seattle Sounders FC is a professional soccer club based in Seattle, Washington. The team was founded in 2007 and joined MLS in 2009. Since then, the Sounders have been one of the most successful teams in the league, winning four MLS Cup championships, two Supporters' Shields, and one US Open Cup.

Portland Timbers, on the other hand, is a professional soccer club based in Portland, Oregon. The team was founded in 2009 and also joined MLS in 2011, the same year as the Vancouver Whitecaps. Unlike the Sounders, the Timbers haven't won the MLS Cup, but they have won one Supporters' Shield and two US Open Cups.

The rivalry between Seattle Sounders and Portland Timbers is intense and often referred to as the Cascadia Cup. This regional rivalry includes the Vancouver Whitecaps, but the games between Seattle and Portland are typically considered the fiercest. The rivalry has been known for its passionate fan support, which includes some of the loudest and most dedicated supporters groups in MLS.