Where did Leo B. Halliwell serve?

Leo B. Halliwell served in Brazil, where he made significant contributions to the Seventh-day Adventist Church's development. His work in this country was marked by efforts to establish educational institutions and promote the church’s mission among the local population. Brazil has a rich history of Adventist activity, and Halliwell's leadership played a crucial role in expanding the church's influence and outreach in the region.

In contrast, while the other countries listed have had their own Adventist movements and leaders, Halliwell's specific contributions and service were tied distinctly to Brazil. His commitment to the mission in that nation helped shape the church's foundation and growth there, distinguishing his impact from that of others who may have served in Argentina, Chile, or Colombia.