Now I know why I stand six feet tall: one of my great-great-great-grandparents was Dutch.
The Dutch were not noted for their height until recently. It was only in the 1950s that they passed the Americans, who stood tallest for most of the last 200 years, said John Komlos, a leading expert on the subject who is professor of economic history at the University of Munich in Germany. He said the United States has now fallen behind Denmark.
Many Dutch are much taller than average. So many, in fact, that four years ago the government adjusted building codes to raise the standards for door frames and ceilings. Doors must now be 7-feet, 6-inches high. [Link]