I'm pretty sure that popular sovereignty is the idea that power lies with the people. I hope this helps you out :)
For god so loved the world that he gave his only begotten son that whoever believe in him should not perish but have everlasting life. John 3:16
The era that heralded the beginning of agriculture was the Neolithic era because it's the meaning of revolution which denotes the time when farming and croping started in America. hope this helps :)