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: "The film "Tap Roots" is loosely based on the life story of a Southern Unionist that held what position in MIssissippi's Reconstruction government?" whose answer is deputy US Marshal.
Each document should contain about 30 words, and these documents should contain useful information.

Query: position of a Southern Unionist in Mississippi's Reconstruction government
Useful Output:

Doc 1: The post-Civil War period is known as the Reconstruction era, when the former Confederacy was brought back into the Union.
Doc 2: Johnson appointed William L. Sharkey, a Union Whig, as provisional governor to oversee Reconstruction in Mississippi.
Doc 3: “Their Unionism was often practical – they wanted to protect their families and preserve slavery and social order – but it was also ideological.
Doc 4: The post-Civil War period in US history is known as the Reconstruction era, when the former Confederacy was brought back into the Union.
Doc 5: Being the center of slavery and cotton culture, heavily agricultural places such as Mississippi seceded first and returned to the Union last.