Final answer:
If the Supreme Court had claimed the power to declare an act of Congress unconstitutional, it would have likely ruled the Sedition Act as unconstitutional due to its violation of the First Amendment and the principles of individual liberties and states' rights.
Step-by-step explanation:
Given the historical context and the constitutional questions raised by the Sedition Act, it is likely that if the Supreme Court had claimed the power to declare an act of Congress unconstitutional at that time, it would have ruled the Sedition Act as unconstitutional. The Sedition Act, which made it a crime to speak openly against the government, violated the First Amendment's guarantee of freedom of speech. Scholars believe that the act would have been deemed unconstitutional because it restricted political speech and violated the principles of individual liberties and states' rights.