This summer showed Major League Soccer that attracting U.S. fans to the game is no longer an issue. It's engaging them that the league sees as its next step.MLS adidas Predator LZ Carnavalup its All-Star game celebration Wednesday night with a 2-1 victory over German power Bayern Munich.The match at Portland's Providence Park capped a wildly successful few months Nike KD 6 GSthe sport stateside, following the U.S. national team's run to the round of 16 in Brazil that drew record television ratings.And it was certainly not lost on the league when an exhibition match between Manchester United and Real Madrid drew nearly 110,000 fans at the Big House in Michigan last week.MLS Deputy Commissioner Abbott met this week with a group of reporters to discuss the state of the league, which is in the midst of its 19th season."From our experience we had a breakthrough in cultural relevance that we hadn't really seen before," he said.Given that breakthrough, it wasn't surprising that one of the biggest themes Abbott hit on was expansion.The league aims to expand from its current 19 teams to 24 teams by 2020. Abbott said further expansion would likely be unwise, based on business models that take into consideration the player pool and television deals."When we started the league, we did a lot to study all the other professional sports leagues, and we studied the North American Soccer League, specifically," he said. "We were concerned not about the ultim  @uc@iix5cj1uaf@uc@