I opened the photo I wanted to work with and a map of Texas to use
as my outline.
First select your outline.
Now move your outline onto the background photo and place it where you want it.
In the layer pallet, highlight the new layer. Hold the control key down and double click
on this layer to select it.
Now click on the eye icon for the layer to make it invisible.
Next highlight the background layer and hit Ctrl J to create a new layer.
With the new layer selected, click on the function icon at the bottom of the
layer pallet and select drop shadow in the layer styles menu.
I selected drop shadow, inner shadow and outer glow.
This give me a very distinct outline. You may choose to
be more or less bold.