It led to a significant decrease in slavery and the slave trade
One of the key ideas of laissez-fair policies was that the government--both state and federal--would play an absolutely minimal role in the economic affairs of the public, since these people believed that government intervention hurt productivity.
You can either talk about police, education (school), highway building, or how taxes are used to pay for all those services. And then explain how whatever service you chose affects your family. Like for example, highway building can cause you or your parents to have to leave earlier because of detours. Or with taxes you can talk about how it puts your family on a budget.
