North America dwarfs South Sudan: about 24,710,000 km² km² against 623,998 km² km². At true size North America is about 39.6× larger — the whole of South Sudan fits into North America roughly 39 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.
South Sudan fits 39× into North America.