Angola dwarfs North America: about 1,249,380 km² km² against 24,710,000 km² km². At true size Angola is about 19.8× larger — the whole of North America fits into Angola roughly 19 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.
Angola fits 19× into North America.