Tourism in the United States

21st century
The travel and tourism industry in the United States was among the first commercial casualties of the September 11 attacks, a series of terrorist attacks on the U.S. Terrorists used four commercial airliners as weapons of destruction, all of which were destroyed in the attacks on New York City, Washington, D.C., and in Pennsylvania with nearly 3,000 deaths.^[23] In the first full week after flights resumed, passenger numbers fell by nearly 45 percent, from 9 million in the week before September 11 to 5 million.^[23] Hotels and travel agencies received cancellations across the world. The hotel industry suffered an estimated $700 million loss in revenue during the four days following the attacks.^[23] The situation recovered over the following months as the Federal Reserve kept the financial system afloat. The U.S. Congress issued a $5 billion grant to the nation's airlines and $10 billion in loan guarantees to keep them flying.^[23]
In the U.S., tourism is either the first, second or third largest employer in 29 states, employing 7.3 million in 2004, to take care of 1.19 billion trips tourists took in the U.S. in 2005.^[24] The U.S. outbound holiday market is sensitive in the short term, but possibly one of the most surprising results from the September 11, 2001 attacks was that by February 2002 it had bounced back. This quick revival was generally quicker than many commentators had predicted only five months earlier.^[25]
The United States economy began to slow significantly in 2007, mostly because of a real-estate slump, gas prices and related financial problems.^[26] Many economists believe that the economy entered a recession at the end of 2007 or early in 2008.^[26] Some state budgets for tourism marketing have decreased, such as Connecticut which is facing soaring gas prices.^[27]
100 million tourists visited Florida in 2015, a record for the nation.^[28]
Attractions
Main article: Tourist attractions in the United States
Today, there exists a wide range of tourist attractions in the United States such as amusement parks, festivals, gambling, golf courses, historical buildings and landmarks, hotels, museums, galleries, outdoor recreation, spas, restaurants and sports.^[29]
Travel warning
After many persons had been killed in various mass shootings in the US, Amnesty International issued a travel warning in August 2019.^[30] Some countries have also issued travel warnings.^[31]