The modern period of Protestant missions parallels 19th-century Western capitalist expansion, which aided northern hemisphere churches in extending their mission work to the south. In some regions, those missions followed a sponsored model, where the church was part of the larger transplanted colonial social order. In others, missions operated in an open religious market, where churches vied for their share of converts. This article compares the work of two American Protestant denominations in an open religious market , looking for the conditions that facilitated or hindered their propagation. It finds that differences in faith and timing of arrival help explain degree of success in the host society.Modern Protestant missions 1 were part of a Western capitalist expansion that took place in the second half of the 19th century, during a period of increased world trade. The expansion brought economic, political, and social consequences to southern hemisphere nations (Brook . In areas under 19th-century colonial rule, Protestant churches used colonial ties to launch a widespread missionary effort. In noncolonial areas, increased trade brought the presence of northern hemisphere immigrants and the rise of new middle-class groups. Both factors facilitated independent mission work.In 19th-century colonial areas Protestant missions tended to follow a sponsored model of religious propagation, operating as established "churches" (Troeltsch 1960). They were part of the larger social order being exported and seen as the religious expression of the colonizing power. 2 Missionaries took advantage of the colonial infrastructure (reliable transportation and communication systems, law enforcement, and land grants) to expand their work in more or less monopolistic ways, spreading churches, schools, and hospitals throughout each colonial nation (