Which legislation allowed the president to deport those deemed dangerous during wartime?

The Alien Act is the correct choice because it was part of a series of laws passed in 1798 during a period of rising tensions between the United States and France, known as the Quasi-War. This legislation specifically granted the president the authority to deport foreign nationals who were considered dangerous or a threat to national security during wartime. This act was justified by the federal government based on the perceived threat of foreign influence and espionage amid the conflict.

The other options do not pertain directly to the power of deportation in the context of wartime threats. For instance, the Naturalization Act primarily dealt with the process by which immigrants could become U.S. citizens. The Sedition Act made it a crime to speak or write against the government, focusing on curbing dissent rather than deportation. The Immigration Reform Act is a more modern piece of legislation that pertains to the regulation of immigration processes and does not relate to the wartime context in the same way as the Alien Act.