Read the passage. march on washington for jobs and freedom courtesy of the national park service how do the headings in the passage to develop the author’s ideas? the headings summarize each of the key issues that motivated different groups to participate in the march. the headings introduce the different groups that participated in the march and their reasons for doing so. they orient readers to understand how the march originated, how it was organized, and what it accomplished. they readers follow the complex chain of events that occurred before, during, and after the march.