 The reason Portland was selected for 2016 and Birmingham for 2018 is that the IAAF wanted more time between events in the UK with London hosting the 2012 Summer Olympics as well as the 2017 World Championships in Athletics along with Cardiff hosting the 2016 IAAF World Half Marathon Championships.Portland would become the beginning of a similar sequence for the US, with the 2021 World Championships in Eugene, Oregon and the 2028 Summer Olympics in Los Angeles.The event took place at the National Indoor Arena with seating for 8,000 spectators.