As of September 2021, the United States was not officially engaged in any declared wars, but was involved in several military conflicts and operations worldwide.
The most notable conflict in which the US has been involved is the ongoing War in Afghanistan, which started in 2001 after the September 11th terrorist attacks. The US launched a military campaign against the Taliban government in Afghanistan that harbored the al-Qaeda terrorist group responsible for the attacks. The US and its allies have been trying to stabilize the country and promote democracy while fighting against various insurgent groups, including the Taliban and the Islamic State of Iraq and Syria (ISIS). As of September 2021, the US was in the process of withdrawing its remaining troops from Afghanistan, although the situation on the ground remained unstable.
Another ongoing conflict in which the US is involved is the War on Terror, which began after the September 11th attacks. This conflict is a series of counterterrorism operations around the world, including in Iraq, Syria, Somalia, and Yemen. The operations aim to disrupt terrorist groups and prevent attacks against the US and its allies. As of September 2021, the US was still involved in counterterrorism operations worldwide, but the scale and intensity of these operations have varied over time.
The US has also been involved in various other military operations in recent years. In 2011, the US and its allies intervened militarily in Libya, aimed at preventing the regime of Libyan dictator Muammar Gaddafi from carrying out mass atrocities against civilians. The intervention succeeded in toppling Gaddafi’s government, but the country has remained unstable and plagued by violence and political turmoil ever since. The US has also been involved in various military operations in Africa, including in Somalia and Niger, aimed at combatting terrorist groups in the region.
The US has been involved in a number of other military interventions and conflicts in recent decades. In 2003, the US led an invasion of Iraq, which toppled the government of dictator Saddam Hussein but led to years of violence and instability in the country. The US was also involved in a NATO-led military intervention in Kosovo in 1999, aimed at preventing ethnic cleansing and violence against the Albanian population in the region. In the 1990s, the US was involved in a number of military interventions in the Balkans, aimed at ending conflicts in Bosnia and Kosovo.
In conclusion, while the US is not currently engaged in any declared wars, it is heavily involved in military operations and conflicts worldwide aimed at promoting US interests and values and maintaining global security and stability. However, these military operations have significant costs, including financial costs, the risk of civilian casualties, and the potential for long-term geopolitical consequences. Therefore, the decision to engage in military operations should always be made with careful consideration and a full understanding of the potential risks and benefits.