This document summarizes how Christian ethics changed between the 1800s-1900s to become more focused on social justice issues like tolerance, equality, and freedom. It provides examples of early advocates like Harriet Tubman, who worked to end slavery through the underground railroad. The document also discusses the increasing acceptance of ideas like evolution from pastors like Harry Emerson Fosdick. Figures like Dietrich Bonhoeffer questioned what Christianity would become in a "religionless" modern world.