2012 DBQ Exercise In the post-Civil War United States, corporations grew significantly in number, size and influence. Analyze the impact of big business on the economy and politics and the responses of Americans to these changes. Confine your answer to the period 1870 to 1900. 2012 DBQ Exercise The impact of big business on the economy and politics and the responses of Americans to these changes Confine your answer to the period 1870 to 1900. 2012 DBQ Thesis Statements