The La Liga, also known as the Spanish Premier League, is one of Europe's most prestigious football leagues. It has been in existence since 1920 and is considered to be one of the best leagues in the world. In recent years, there have been several significant changes in the league's structure, with new teams joining the competition.

One of the most notable changes was the introduction of the Champions League, which was introduced by the UEFA (Union of European Football Associations) in 2004. The Champions League is a major tournament for European football, with 16 teams participating in it. Each team plays against each other in a round-robin format, with the top four teams advancing to the knockout stage.

In the 2018-2019 season, Real Madrid emerged as the dominant force in the league. They finished the season with 150 points, which made them the only team that had won all their home matches this season. Real Madrid's victory came after they defeated FC Barcelona in the final, where they scored three goals in the first half before conceding two goals in the second half.

On the other hand, Barcelona struggled throughout the season. They finished the season with just 79 points, which left them fifth place in the table. Despite this, Barcelona managed to win the Copa del Rey, the domestic cup competition, which is the highest achievement for any club in Spain.

In conclusion, both Real Madrid and Barcelona have made impressive contributions to the La Liga and have been successful in their respective competitions. However, Real Madrid has always stood out as the dominant force in the league, while Barcelona has struggled in recent seasons.