President Franklin D. Roosevelt was the President that tried to expand the size of the supreme court to 15 justices.
The United States Supreme Court is the highest court in the federal judiciary of the United States. It has final appellate jurisdiction over all federal court cases in the United States, as well as state court cases involving a point of federal law.
Roosevelt oversaw the mobilization of the American economy to support the war effort and implemented a Europe-first strategy, launching the Lend-Lease program and prioritizing the defeat of Germany over that of Japan.
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