There are plenty of arguments.
Don’t you hate it when somebody claims piddly Mall of America (2.77 million sq ft) is biggest?
Eastwood Mall Complex (3.2 million sq ft) in Niles, Ohio is largest in the USA.
West Edmonton Mall (3.77 million sq ft) is largest in North America.
But if you like BIG MALLS, the place to go is Manila, Philippines:
SM Megamall(3.74 million sq ft)
SM Mall of Asia (4.20 million sq feet)
SM City North EDSA (5.20 million sq ft)

The only larger malls than EDSA in Manila are the Golden Resources Mall, Beijing (6.0 million sq ft) and the South China Mall (7.1 million sq ft).
Projected to be much larger, when finished, is the Abraj Al Bait Mall, Saudi Arabia. It’s being built directly across from the Holy sites in Mecca.
Other contenders are under construction in China and Thailand.
wikipedia – List of largest shopping malls in the world
