Africa dwarfs Mexico: about 30,370,000 km² km² against 1,962,279 km² km². At true size Africa is about 15.5× larger — the whole of Mexico fits into Africa roughly 15 times.
The old Mercator map treated both about equally (1× vs 1.2× inflation), so at least their relative sizes were preserved — even if both were drawn at the wrong absolute scale.
Mexico fits 15× into Africa.