This alternative Social Darwinism is completely contradictory to the first form, as the economists argued for individual freedom and competition, whereas Bagehot believed that superior societies were distinguished by superior discipline and organisation. This national selection theory became more popular towards the end of the 19th century, as class animosities were increasingly obscured by extreme nationalism. The end result of this nationalist upsurge was the First World War, when the warring populations were willing to put up with almost any suffering for victory. So we can see that natural selection was twisted to add support to whatever belief became popular or convenient.
Perhaps the most revolting example of this concerns conflict between different races. 19th century colonial expansion brought Europeans into contact with many societies based on much lower technology. In Africa, the local population was first harvested for slaves, and then conquered. In America, the inhabitants were almost exterminated. Natural selection could be used to imply that such behaviour was perfectly natural and inevitable. Some attempts were made to claim that other races were less evolved than Europeans and closer to the apes. In the 20th century, the Nazis carried this perverse racial Darwinism to its logical end, when they declared that the Aryans were the master race, with all others destined to be enslaved or destroyed. Ironically, Darwinian evolution completely undermines those abominable doctrines. It is clear that we are all one species, with a common ancestor. Recent genetic research has shown that there is little genetic variation between races, with most variation not being racially linked.