I would recommend Battle Cry of Freedom by James McPherson
Answer:
Era
Explanation:
Epoch is an English word that is used to describe a specific period or simply a certain era about the occurrence of events or certain places or people.
Hence, in the statement "The invention of email opened an important epoch in the history of communication."
The term which can replace epoch without changing the meaning of this sentence is ERA.
In May 1917 President Woodrow Wilson and Secretary of War Newton Baker chose Pershing to command the American Expeditionary Force going to Europe in support of the Allies. Arriving in France during June, Pershing immediately began planning the organization and employment of a large American army.
It involved the re-appropriation of Indian land.
