The Humane Party chose to separate the remainder of the abolition process into two different Constitutional amendments—namely, the APE Amendment and the Abolition Amendment—in order to accomplish the ultimate goal—abolition—as fast as possible.
Specifically, the APE Amendment breaks, for the first time in U.S. history, the species barrier to legal standing (often called “rights” or “personhood”). This speciesist barrier is formidable: it has endured for thousands of years in all human cultures all around the world. By being limited in scope to those species to which humans are most recently related, the APE Amendment is optimized to break this psychological and philosophical barrier immediately. This amendment represents the very cutting edge of the modern abolitionist movement.
Once the species barrier has been overcome through the APE Amendment, the road to emancipation of all other animals by way of the Abolition Amendment will be clear.
Thus, in the Humane Party’s estimation, the two-step process described above will produce the desired result—abolition of slavery for all species—faster than would a single-step process.