Final answer:
B. By addressing domestic issues effectively. George Washington expanded presidential leadership by promoting diplomacy with foreign nations and assembling a cabinet that shaped the executive branch.
Step-by-step explanation:
George Washington demonstrated presidential leadership through the issuance of his address by promoting diplomacy with foreign nations. This is evident as Washington confronted foreign policy challenges, maintaining the territorial integrity of the United States, and relied on both military and diplomatic means to secure the nation's borders and economic development. Washington aimed to build respect for the new country, implementing ideas to strengthen the nation and to develop a foreign policy that balanced nuanced relations with countries like France and Britain.
One way George Washington expanded the power of the presidency was through assembling a cabinet of advisors, which included influential figures like Thomas Jefferson and Alexander Hamilton, indicating his method of expanding the powers of the presidency by institutionalizing his advisors and harnessing their expertise.