The legend is that Newton discovered Gravity when he saw a falling apple while thinking about the forces of nature. Whatever really happened, Newton realized that some force must be acting on falling objects like apples because otherwise they would not start moving from rest.
The religons have changed
The things they are doing
Buildings
Weather
Disasters
Attacks
Problems with gas staions
Schools
Education
9-11
That is for the passed only
It was divided because of the tensons between the allies and soviets
So to me it looks like that into more of the future more people are born in Urban areas and in the Rural areas it looks like it will slowly go down till there is little to none left.