United States covers 9,439,424 km² km² on the new Equal Earth world map — 7.0%% of all land on Earth, making it the 3rd largest country in the world and the 2nd largest in North America. At 45° latitude the old Mercator map inflates area by about 2×, so it drew United States closer to 18,690,060 km² km² — a difference of roughly 98%%.
For scale: United States is roughly the same size as China (9,371,225 km² km²).
You could fit 3 of Argentina inside United States.