Which research sources are examples of secondary sources? Select two options.

a copy of the Treaty of Versailles

a documentary about the American Civil War

an encyclopedia entry about the Spanish-American War

a government chart showing official census data from 1920

a televised interview with a survivor of the sinking of the Titanic

A documentary about the American Civil War/An encyclopedia entry about the Spanish-American War.

Explanation:

A secondary source is a source constructed from excerpts from primary sources, which are the most accurate sources related to a historic event.

Primary Sources

A copy of the Treaty of Versailles - The Treaty of Versailles is the primary sources of the formal conclusion of World War I.

A government chart showing official census data from 1920 - It offers information of the US population in 1920.

A televised interview with a survivor of the sinking of the Titanic - The survivor witnessed the sinking of the Titanic.