“Czech mass immigration to the United States had begun at mid-century, and by 1890 the [US] national census recorded 118,106 natives of Bohemia, although many of the additional 123,271 natives of Austria were probably Czech-speaking Bohemians and Moravians.”
“By 1910 the United States census recorded 539,392 Czech immigrants by native language and their children, while the Austrian census of the same year recorded a Czech-speaking population of 6,291,237 in Bohemia, Moravia and Silesia. Thus, first- and second- generation Czech residents in the United States amounted to at least 8.6 percent of the source population in the Czech lands”
Source: BOHEMIAN VOICE: CONTENTION, BROTHERHOOD AND JOURNALISM AMONG CZECH PEOPLE IN AMERICA, 1860-1910. A Dissertation by DAVID ZDENEK CHROUST. Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY, May 2009