"And I think that to be respectful to opponents is to play hard against opponents, and as Alex said, it's a tournament where goal differential is important", Ellis said.
The result also far outstrips the USA's own record result in a World Cup match, which had been their 7-0 defeat of Taiwan in the quarter-finals of the first tournament in 1991.
Morgan celebrated her incredible night by counting off each of her goals on her hand.
The two teams were the last to kick-off in the group stage for the month long tournament.
"I did say I thought it was excessive and disrespectful the goal celebrations of the American team once the score hit 8-0".
"I respect Thailand, I spoke to some of them afterwards and they should keep their heads up".
The U.S. women's national team has been slammed for its celebrations against Thailand, with current Canadian national team star Diana Matheson saying USWNT manager Jill Ellis should be embarrassed at her team's antics. "Celebrate. Would you tell a men's team to not score or celebrate?"
The U.S. team cancelled a scheduled training session Wednesday.
USA Today columnist Nancy Armour was unapologetic.
"We played against the Americans before where you have a player like Christine Sinclair scoring three goals and she would never even think about counting how many goals she has on one hand", Kyle said. Alongside Abby Wambach, she appeared on American Idol to announce that the season 14 victor would record the official song for Fox's coverage of the 2015 FIFA Women's World Cup. You want those players to have those feelings because then they go into games. "Maybe you'll get a participation trophy and an orange slice while you're at it".
Retired American worldwide Taylor Twellman, now an ESPN analyst, tweeted he had zero problems with the scoreline given "this is THE tournament BUT celebrating goals (like #9) leaves a sour taste in my mouth like many of you". "We accept our mistakes and we are going to improve".
The Thailand rout set a number of Women's World Cup records.
Morgan was joined on the scoresheet by five other teammates.
Horan smashed in the third in the 32nd minute, but the floodgates really opened in the second half as Ellis's side scored four times in six minutes shortly after the restart.
The U.S. outshot Thailand 30-2 (21-2 in shots on target) and had 75 percent possession.
Although, it might not be considered surprising, given that two-time winners Germany went on to become champions that year and Argentina secured their first ever Women's World Cup point after holding Japan to a 0-0 draw on Monday. The team is 7-1-2 overall this year, with six straight wins going into the FWWC, and their seven different scorers against Thailand set a record for most in a FWWC game. "This is the World Cup, not a rec league tournament", she wrote.