Final answer:
Leaders are expected to focus on providing for the nation's defense and on ensuring participation of all social classes in managing state affairs, based on the principles set forth in historical pledges and documents.
Step-by-step explanation:
According to the pledge, leaders were expected to focus on providing for the common defense and unifying classes in the management of state affairs. Providing for the common defense refers to the importance of creating a nation capable of protecting itself and its citizens. This principle was a fundamental goal outlined in the Preamble to the US Constitution. The second expectation, unifying classes in the management of state affairs, implies that leaders should work towards social cohesion and inclusive governance, allowing every level of society to participate in the administration of the country.