What's the difference between the traditional open field system and Lord Tonshend's crop rotation?

How was classical persia's extensive network of roads important to its civilization?

What type of sentence has at least one independent and one dependent clause

How would high tariffs hurt america? a. fewer immigrants would be able to move to america b. sales of american products to other countries would go down c. americans would sell more goods to other countries d. goods imported from other countries would cost less