Oh, I'm sorry. I didn't know this wasn't kosher. It's not a free trial issue although its similar; I need the longitude and latitude of each zip code and this is the only place I've been able to find this data and they only allow you to submit thirty zip codes a day. This would take nearly three years.
The project has to do with the race-perception effects of inducing slave ownership in the 1850s. If someone is "induced" to own slaves by owning at the time of the cotton gin's penetration optimal cotton land, does this create in the family a self-serving bias in the form of racism. The longitude and latitude data are useful for giving distance to the nearest port which is also a factor for how optimal cotton production is in any particular zip code as transportation costs are theoretically proportional to distance.
Will you consider helping me understand what to do?