Why is the cause and effect structure so common in expository writing?

By 332 bce which regions had fallen to alexanders army

Which fact would this be, and how might you verify the truth?

How did the war of 1812 contribute to an increase in u. s. manufacturing? a) the war provided more resources for factories to increase production. b) the war promoted trade between countries so that americans could focus on fighting. c) the war cut americans off from their previous supply of imported manufactured goods. d) the war limited transportation in america, making it necessary to import manufactured goods.