Okay, I require assistance for this DBQ, can anyone help please?
The DBQ topic is...

To what extent and for what reasons did the policies of the federal government from 1865 to 1900 violate the principles of laissez faire, which advocated minimal government intervention in the economy? Consider with specific reference to the following three areas of policy: railroad land grants, control of interstate commerce, and antitrust activities.

You should definitely check out the Chapter 24 notes:

http://www.apnotes.net/ch24.html