Argentina dwarfs United States: about 2,782,703 km² km² against 9,439,424 km² km². At true size Argentina is about 3.4× larger — the whole of United States fits into Argentina roughly 3 times.
Argentina sits in South America, United States in North America. On the old Mercator map the latitude gap distorted how large each felt beside the other; at true size the answer is simply 3.4×.
The old map muddied it further: Mercator inflates Argentina about 1.5× and United States about 2×, so on a Mercator-style map this pair appears 4.5× apart instead of the true 3.4×.
Argentina fits 3× into United States.