Darwinism is used here to promote abortion (eliminating the weeds of society) and Marxism so your theory falls short on all accounts. I would be interested in one thing it has been used to promote which is not enlarging government or eliminating God from America.
Darwinism is anti freedom, as in you did not build that.
It basically says you cannot create nor fashion someone better than yourself, you have to follow the law of darwin and not that of God to clone someone. It is horrible.
I am going to take from your statement that you are an ignoramus when it comes to US history, especially of the 19th Century. What you are spewing has nothing to do with anything stated. As for Marxism being a product of Darwinism is so stupid to be laughable. The concept of survival of the fittest is alien to Marxist ideology. Fascists have used the concept to justify the conquest of other people, example Mussolini on Ethiopia, but Marxists reject Social Darwinism completely. Marxists are about class warfare and reject Nationalism. Fascists used the concept in 20th Century for their purposes, while proponents of a rigorous American capitalism used it in the 19th Century. They had nothing to do with each other. The proponents of Social Darwinism during the Gilded Age were small government men. If you ever took any courses in college in US history, you would remember Leftist professors attacking the great industrialists because they were Social Darwinists, in the context of the late 19th century US.