AT LEAST FIVE JUDGES must agree to an opinion for the supreme court to issue a decision.
Supreme court justices handles a lot of legal cases regularly. The supreme court decision makers is usually made up of one chief justice and eight other members. For each of the case brought to the supreme court, the judges have to agree about what their decision on the case is going to be. For a decision to be valid, at least five judges must agree to the decision.
In advocating for the League of Nations, Wilson wanted to create a unity between nations in order to avoid the same issues that led to World War I. Unfortunately the US rejected this proposal.
Americans were struck with fear and put Japanese in internment (not concentration) camps. Then, America decided to go to war against the Empire of Japan, then the rest of the Axis declared war on America.