The United States of America has engaged in multiple military conflicts over the past few decades, some of which have been controversial and widely criticized both within the country and internationally. Here is a brief overview of some of the wars imposed on the world by the US:

1. Vietnam War (1955-1975): The Vietnam War was a prolonged conflict between communist forces in North Vietnam and the United States and South Vietnam. The American intervention in Vietnam began in 1964 and lasted until 1975, costing the lives of over 58,000 American soldiers and more than a million Vietnamese people.
2. Gulf War (1990-1991): This was a military conflict between Iraq and a coalition of 35 countries led by the United States. The war was fought in response to Iraq’s invasion of Kuwait. The US-led coalition’s victory in the conflict led to the restoration of Kuwait’s independence and sanctions being imposed on Iraq.
3. Afghanistan War (2001-present): The US invaded Afghanistan in response to the 9/11 terrorist attacks. The objective was to depose the Taliban government and prevent the country from being used as a base for terrorist operations. The conflict has continued for almost two decades, killing thousands of Afghan civilians and American soldiers.
4. Iraq War (2003-2011): A war launched by the US-led coalition that overthrew the Saddam Hussein government in Iraq. The war was controversial because the evidence used to justify the war, such as the presence of Weapons of Mass Destruction in Iraq, was faulty
5. Syrian Civil War (2011-present): The US has intervened in the Syrian conflict through its support of various rebel groups fighting against the government of President Bashar al-Assad. The Syrian civil war has killed hundreds of thousands of people and created a massive refugee crisis.

The United States has been involved in several military conflicts, some of which have drawn criticism from various quarters due to the massive loss of life and collateral damage. These wars have had profound consequences for the countries involved, such as loss of life, economic damage, and political instability.