In the 19th century, which trait was used to label a person as caucasoid?

In the 19th century,SKIN trait was used to label a person as Caucasoid.

mount st. helens in washington erupts, causing a massive avalanche and killing 57 people on this day in 1980. ash from the volcanic eruption fell as far away as minnesota. seismic activity at mount st. helens, which is 96 miles south of seattle, began on march 16.

aa dikha du tujhe mera wala dance