Why might a biographer of borglum have difficulty descriptions what the subject was doing before 1901?

A biographer of Borglum might have difficulty describing what he was doing before 1901 because there may be limited historical records or documentation covering that period in his life. Without concrete evidence or reliable sources, it may be challenging to piece together a detailed account of his activities and experiences during that time. Additionally, personal circumstances or changes in Borglum's life prior to 1901 could also contribute to gaps in the biographical information available.