Final answer:
After the September 11 attacks, there was a rise in patriotism and trust in government in the US, accompanied by increased scrutiny of Muslims. Internationally, the US saw an initial wave of sympathy that later became complicated by its military actions in the Middle East.
Step-by-step explanation:
The September 11, 2001, terrorist attacks profoundly altered the perception of the United States both domestically and internationally. Domestically, there was a surge in patriotism and trust in government, with many Americans rallying around the flag and willing to compromise some personal liberties for perceived security. Simultaneously, incidents of suspicion and hostility toward Muslims and those perceived to be of Middle Eastern descent increased, although public opinion about Muslims became more favorable post-9/11, possibly influenced by President Bush's appeals against blaming Muslims as a whole.
Internationally, the terrorist attacks affected how the world saw the United States, leading to an outpouring of sympathy but also criticism over subsequent military actions and policies. The US-led 'War on Terror,' especially the invasions of Afghanistan and Iraq, sparked global debates over the justifications and consequences of such military interventions. These events reshaped global politics and contributed to an era of increased polarization and redefinition of liberty and security.