German diaspora
An early variety of Romanesque Revival style known as Rundbogenstil ("Round-arched style") was popular in German lands and in the German diaspora beginning in the 1830s. By far the most prominent and influential American architect working in a free "Romanesque" manner was Henry Hobson Richardson. In the United States, the style derived from examples set by him are termed Richardsonian Romanesque, of which not all are Romanesque Revival.