You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "what is the longest war in us history?" whose answer is War in Afghanistan.
Each document should contain about 30 words, and these documents should contain useful information.

Query: longest war in us history
Useful Output:

Doc 1: Two Decades in Afghanistan​​ The longest war in U.S. history has come at the financial cost of close to $1 trillion. It has killed more than 2,
Doc 2: The rapid conquest of the country by the Taliban and the chaotic withdrawal of the US bring an end to a war that spanned four administrations.
Doc 3:  U.S. foreign wars together in 2014. It shows that Afghanistan is the longest war in American history by far, running for nearly twice as
Doc 4: Afghanistan is the longest war in American history, outlasting the Civil War, Spanish-American War, World War I, World War II, and Korean War
Doc 5: After nearly 20 years in Afghanistan, the US military, at President Biden's direction, withdrew troops from the country, bringing an end to