Most of the scholars preached against the Mongol rule so the Mongols in power made sure that the scholars do not get high positions in the new government.
<span>The region became an area of tension and unrest. (the </span> answer is A .)
The battle you are referring to is actually called the Battle of the Ironclads. In this battle, it was the Merrimac (from the Confederacy) versus the USS Monitor (from the Union). This was the first battle between iron-fortified vessels in the Civil War. This battle ended up in a draw but represented a new form of fighting that both the Union and Confederacy had to be ready for.
Different ideas, cultures, religions, lots of factors.