Which among the following countries became the newest member to join the North Atlantic Treaty Organization (NATO) in March 2024?

Sweden

The correct answer is Option (4) → Sweden

Sweden became the newest member to join the North Atlantic Treaty Organization (NATO) in March 2024.

Sweden officially joined the alliance as its 32nd member on March 7, 2024, after depositing its instrument of accession with the Government of the United States in Washington, D.C. This move marked the end of over 200 years of Swedish military non-alignment, a policy shift driven by the changing security environment in Europe following the 2022 invasion of Ukraine.