Bar Exam Practice Questions 2025 - Free Bar Exam Practice Questions and Study Guide

The federal government's responsibility for common defense is primarily encapsulated in its obligation to raise and maintain an army. This duty is rooted in the Constitution, specifically in the Preamble, which outlines one of the primary purposes of the federal government as providing for the common defense. By maintaining military forces, the government ensures the nation's security against external threats and supports the defense of its interests.

The other options do not accurately reflect the core responsibility of the federal government in terms of common defense. For instance, while education, postal services, and regulation of commerce are important functions of government, they do not directly pertain to the concept of common defense as articulated in the founding documents. The focus on raising and maintaining an army highlights the specific constitutional mandate aimed at safeguarding national security, thereby making it the most accurate description of the federal government's duty in this regard.