F1 chief executive Bernie Ecclestone has said he wants more US races on the sport's calendar.After a five-year absence from the country, F1 returns to the US in 2012 where the November 18 race will see the opening of the new Circuit of the Americas in Austin, Texas.Ecclestone wanted two American races for 2013, until plans for a street race in New Jersey were put on hold due to financial reasons until at least 2014.'NOT VERY BIG' IN THE USEcclestone said: "It's a world championship, so you need the US. America is about as big as Europe. So we should have the same number of races (in each)."In 2013, seven of the 19 grands prix - Spain, Monaco, the UK, Germany, Hungary, Belgium and Italy - will be in Europe, the sport's traditional homeland.The F1 chief executive admitted the sport is "not very big" in the US. For now, many F1 experts are simply relieved that the US is back on the calendar. Mario Andretti said: "I can only say thank god for the Texans!"McLaren boss Martin Whitmarsh said: "This is a golden opportunity for the sport to finally put down roots and find a long-term home (in the US)."After contractual and construction delays, the Circuit of the Americas is a hive of activity ahead of the inaugural race.Signs, seats and landscaping are still being finished off. Circuit spokeswoman Julie Loignon said: "Things are very hectic, but everyone is making steady progress."