The Brief Las Vegas is seeing a decline in tourists this summer as Americans tighten their spending and fewer international tourists make the trip to Sin City. The Las Vegas Convention and Visitors Authority saw a double-digit decline in visitors in June compared to the same time last year. Why is tourism slumping in Las Vegas? Convention traffic, a huge moneymaker for the city, has declined, and international visitors are also down, particularly from Canada and Mexico. The Las Vegas Strip and Bellagio Water Fountain Show is viewed after dark on February 10, 2023 in Las Vegas, Nevada.