False. The Panic of 1819 was due to unregulated banking practices and a decrease in the market for agricultural goods.
Answer:
what are you doing here with your mother now that you have schooled
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