The Corpis juris (or luris) civilid is the modern name for a collection of fundamental works in jurisprudence, Issued from 529 to 534 by order of justinian I, Eastern roman emperor
Most countries dont need "justification" for joining a war, typically the only justification is a decision backing up allies, and under this definition, the US was justified, Japan had also initiated aggression againts the US, giving the US an incentive to join the war, so yes, its likely that they were justified in joining the war, for several reasons
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Kublai Khan learned to use siege warfare and trebuchets to overcome Sung defenses is the correct answer.
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