What economic doctrine was typically used during the post civil war era

Laissez-faire, in the capitalist world this is an important doctrine that states that businesses should have the right to as they please with no government intervention. The doctrine promotes capitalism and business overall, in hopes to have a free economy. 

There’s no picture, but i’ll give you a few of expeditions. lewis and clark began in 1804, louisiana purchase 1802, james town 1607