The period of american literature that was formed during the civil war was developed between the years

1900-1960
1850-1880
1500-1700
1700-1850

Explanation:American literature is literature written or produced in the United States of America and its preceding colonies (for specific discussions of poetry and theater, see Poetry of the United States and Theater in the United States). Before the founding of the United States, the British colonies on the eastern coast of the present-day United States were heavily influenced by English literature. The American literary tradition thus began as part of the broader tradition of English literature.

The revolutionary period is notable for the political writings of Benjamin Franklin, Alexander Hamilton, and Thomas Paine among several others. Thomas Jefferson's United States Declaration of Independence solidified his status as a key American writer. It was in the late 18th and early 19th centuries that the nation's first novels were published. An early example is William Hill Brown's The Power of Sympathy published in 1791. Brown's novel depicts a tragic love story between siblings who fall in love without knowing they are related.

the underlined phrase is an example of : understatment