Madagascar dwarfs North America: about 594,622 km² km² against 24,710,000 km² km². At true size Madagascar is about 41.6× larger — the whole of North America fits into Madagascar roughly 41 times.
The old Mercator map treated both about equally (1.1× vs 1× inflation), so at least their relative sizes were preserved — even if both were drawn at the wrong absolute scale.
Madagascar fits 41× into North America.