"The Call of the World; or, Every Man's Supreme Opportunity" by William E. Doughty is a missionary resource written in the early 20th century. The work aims to address the pressing questions surrounding the advancement of Christianity globally, with a focus on America's role in this mission. Doughty provides a detailed analysis of world conditions that favor the spread of Christianity and emphasizes the need for cooperative efforts among missionary societies to address the growing spiritual needs across various cultures. The opening of the book presents a foreword that outlines the fundamental concerns regarding mission outreach, particularly emphasizing the responsibility of American Christians. Doughty suggests that the current conditions in the world, such as improved communication and the accessibility of previously closed nations, signal an unprecedented opportunity for evangelistic efforts. He discusses the need for unity and increased missionary engagement, highlighting key indicators of progress and underscoring the urgency for men of faith to commit themselves to the global outreach of Christianity. Through this analysis, the author sets the stage for further exploration of the challenges and strategies vital for the effective propagation of the Christian faith in a rapidly changing world. (This is an automatically generated summary.)