According to a Google search:
"While precise data for the average height of Mexican males in 1929 is difficult to find, based on available research, estimates suggest that the average height of adult males in central Mexico during that period was around 5'4" to 5'6" (166.5 cm) or 158.5 cm."
These guys would appear to fit in that general category. At the same time, so-called Caucasian American men were about 5' 7" tall, not significantly taller, but only a couple inches do make a difference visually in that height range.
Marshall