I believe the answer is: Discrimination
In psychology, Discrimination refers to the ability to create different responses after analyzing the outcome of various stimulis.
This form of action could only be done after we develop the ability of cognitive generalization which started to develop by the age of 8.<span />
Answer:
Capitalism.
Explanation: Last time someone tried anything else, Russia ended up with Lenin, and China got Mao Zhedong. I'll take my flipping chances with this mess of a country any day.
The Transcontinental Railroad innovation had the GREATEST impact on westward migration immediately after the American Civil War.
After the Civil War, there was great interest and opportunity with westward expansion. With the invention of the railroad, the transport of goods and people became quicker and less expensive than ever before.
We show that municipalities that are exogenously exposed to the Drug War experience a 40% decrease in export growth on the intensive margin. Large exporters suffer larger effects, along with exports of more complex, capital intensive, and skill intensive products. Finally, using firm level data, we provide evidence consistent with violence increasing marginal exporting costs.