Grasslands are

a.

characterized by heavy rainfall year round

b.

characterized by warm temperatures year round

c.

found in the interior of continents

d.

located only in north america

I think the answer is c.

c.  found in the interior of continents

A,) cause a & b are equal & both gives 180°

It is the doctrine that the us had the right and duty to expand throughout north america. it just means they believed they had the right to expand westward and they did! they stated with the 13 colonies and then they kept moving gaining different territories throughout the years