North America dwarfs Saudi Arabia: about 24,710,000 km² km² against 1,925,871 km² km². At true size North America is about 12.8× larger — the whole of Saudi Arabia fits into North America roughly 12 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.
Saudi Arabia fits 12× into North America.