C.That it was wrong and they had an obligation to change it
A. The U.S.S.R. was dissolved in December 1991.
It was to prevent slavery in new the lands gained from the Mexican War.
A land between the rivers
Answer: New technology methods
Explanation: Techonology itself is developing quick from day to day. It is important to try and add new things that can improve it. So developing a specific method that is very well planned and established can advance technology.