How might a trait travel over great distances?

Below is the complete question. 

Many different traits make up a culture. During an exchange known as cultural diffusion, some of those traits are spread from one culture to another. How do you think cultural diffusion works? How might a trait travel over great distances? What cultural traits do you think are the most likely to be passed from culture to culture?

Below is the

The first trait is that the region is rural in general character.Rural suggests open country,farming and contrasts to city life(+)