North America dwarfs Thailand: about 24,710,000 km² km² against 515,720 km² km². At true size North America is about 47.9× larger — the whole of Thailand fits into North America roughly 47 times.
The old Mercator map treated both about equally (1× vs 1.1× inflation), so at least their relative sizes were preserved — even if both were drawn at the wrong absolute scale.
Thailand fits 47× into North America.