I need help with these two questions

The first should be more developed. the second should be less developed. i hope this helps

Each side has to be less then the sum of the other two sides.a, b, c, and e work.

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