Nigeria dwarfs North America: about 911,496 km² km² against 24,710,000 km² km². At true size Nigeria is about 27.1× larger — the whole of North America fits into Nigeria roughly 27 times.
The old Mercator map treated both about equally (1× vs 1× inflation), so at least their relative sizes were preserved — even if both were drawn at the wrong absolute scale.
Nigeria fits 27× into North America.