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The Vietnam War, the Great Depression, the 9/11 terrorist attacks, and the COVID-19 pandemic have all had significant and far-reaching impacts on the country.

The Civil War fought from 1861 to 1865, resulted in the deaths of over 600,000 Americans and caused widespread destruction across the country. It also led to the end of slavery and the reunification of the nation, but the scars of the war and its aftermath continue to impact American society to this day.

The Great Depression, which began with the Stock Market crash of 1929, led to widespread unemployment, poverty, and economic hardship for millions of Americans. It lasted for over a decade and had a profound impact on the country's economy and social fabric.

The 9/11 terrorist attacks, which took place on September 11, 2001, resulted in the deaths of nearly 3,000 people and led to a significant shift in US foreign and domestic policy. It also had a lasting impact on the country's sense of security and led to changes in airport security, Immigration policies, and the way the US engages with the rest of the world.

The COVID-19 pandemic, which began in 2020, has resulted in the deaths of hundreds of thousands of Americans and has had a profound impact on the country's economy, healthcare system, and daily life. It has also exposed and exacerbated existing social and economic inequalities in the US.

All of these events have had devastating consequences and have shaped the course of US history in significant ways. It is difficult to pinpoint one as the worst, as they have all had far-reaching and long-lasting impacts on the country.

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