In his professional career, Clowes took a keen interest in the United States and travelled there many times, beginning in 1890, when he made an extensive study of race relations in the Southern States.
Dalam karier profesionalnya, Clowes tertarik dengan Amerika Serikat dan bepergian ke sana berkali-kali , mulai tahun 1890, ketika ia melakukan studi ekstensif dari hubungan ras di Amerika Selatan.