The details about the inpections immigrants faced, in a presentation about their experience of coming to America would fit best as a third element in a presentation.
First of all, I would present the conditions that made immigrants leave their country of origins and emigrate to another place where they could try to look for a better live. That is, to present the problem and their needs.
The second element would be the conditions that America offers to them. This is to explain why they choose the USA as their destination and how they expect to improve their conditions here.
And the third element would be the inspections and restrictions these immigrants find once they decide to come or even at their arrival at the USA border.
Once you state the problem (the need to migrate) and the possible solution (coming to America), the third step should be presenting the inspections they will encounter when they decide to come to the USA or once they arrive.