Final answer:
The military involvement in Afghanistan impacted the United States by increasing national pride, working towards establishing a democratic government, and facing criticism from other nations.
Step-by-step explanation:
The military involvement in Afghanistan had a significant impact on the United States. Firstly, the United States experienced a surge in national pride as its troops quickly destroyed terrorists training bases and worked towards capturing Al-Qaeda members. Secondly, the United States aimed to establish a more democratic government in Afghanistan that would align with U.S. interests. Lastly, the United States faced criticism from other nations but maintained its seat on the United Nations Security Council.