Algeria dwarfs United States: about 2,322,788 km² km² against 9,439,424 km² km². At true size Algeria is about 4.1× larger — the whole of United States fits into Algeria roughly 4 times.
Algeria sits in Africa, 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 4.1×.
The old map muddied it further: Mercator inflates Algeria about 1.3× and United States about 2×, so on a Mercator-style map this pair appears 6.3× apart instead of the true 4.1×.
Algeria fits 4× into United States.