In his work, "Early Croatian Immigration to America After 1945", Prpic states that there were around 3,000 organizations founded between 1880 and 1940 in the United States.
U svome dječu, "Early Croatian Immigration to America After 1945" (Rana hrvatska imigracija u SAD-e nakon 1945.), George Prpic drži kako je bilo oko 3 000 organizacija osnovanih u razdoblju od 1880. do 1940. u Sjedinjenim Državama.