The correct response regarding the impact of the U.S. Supreme Court during Monroe's presidency under Chief Justice John Marshall is:
The Court expanded the power of the federal government by making it easier for the government to regulate trade.
John Marshall's leadership of the Supreme Court established important precedents that reinforced federal authority over state laws and supported the economic growth of the nation through the regulation of commerce and trade. Cases like Gibbons v. Ogden (1824) exemplified this trend, as the Court affirmed the federal government's power to regulate interstate commerce.