Answer:
In his speech, Obama uses the story of people helping slaves to escape as an example of how one person can make a big difference
Step-by-step explanation:
In this speech, Obama talks about exceptional people who have helped to stop the slavery in the world, and also what he calls modern slavery, people can be trapped or abused in many different ways and by helping them either though a big association or a small group we can change the world and fill it with hope step by step.