Land size (per Wikipedia):
Australia: 7,688,287 km2
US: 9,833,520 km2
EU: 4,225,104 km2
Australia is huge, but it isn’t as large as the US, much less the US plus the EU.
Edit (quoting Wikipedia as I’m going down the rabbit hole here):
“The contiguous United States occupies an area of 3,119,884.69 square miles (8,080,464.3 km2). Of this area, 2,959,064.44 square miles (7,663,941.7 km2) is actual land, composing 83.65 percent of the country's total land area, and is comparable in size to the area of Australia.”
Well we have 5.9 million square kilometers of Antarctica so checkmate lol.