Final answer:
The number of people who started the march on March 17, 1966, is not specified in the question. Similarly, the question does not provide information on the number of people marching when the march concluded.
Step-by-step explanation:
The question lacks specific details about the number of participants at the beginning of the march on March 17, 1966, as well as the concluding number of marchers. In historical events, the size of marches and demonstrations can vary widely based on factors such as the cause, location, and public participation.
Without precise information on the starting and concluding numbers, it is not possible to provide a specific answer. Additionally, the nature and purpose of the march are crucial factors influencing participation, and historical records or accounts would be needed to determine the actual figures.
Historical events often involve fluctuations in participation, and obtaining accurate data may require consulting reliable sources, records, or eyewitness testimonies from that specific date in 1966. Therefore, the answer remains open-ended without specific details regarding the size of the march on March 17, 1966.