The battle between the USS Monitor and the CSS Virginia was significant because it was the first battle that used ironclad ships.
This battle, known as the Battle of Hampton Roads, took place in March of 1862. This newly developed technology had never been used in American warfare up to this point. There was no clear winner of this battle. However, it is remembered because it changed the way naval battles would be fought by the US military.
federalism decentralizes politics and policy-making by devolving powers from the federal or central government down to governors at the state level. This helps to ensure that the policies that are implemented are debated and formulated subject to input from the two levels
Science did not emerge as a recognizable system of study in the 800s. This is a false statement.
The scientific pursuit of knowledge came to be much later on, a few centuries indeed. The thing was that during the 800s, there were perhaps a handful of individuals around Europe who were doing scientific discoveries, with a major shift happening only after a few centuries later.
They ruled over present day Iran.