How does neo-Darwinism differ from Darwinism?

The English word 'neo-darwinism' means a modern Darwinian theory that explains new species in terms of genetic mutations

A mathematical and experimental appreciation of genetics coupled with natural selection and the work of systemists in taxonomic fields.

Before one can answer that question you need to make it clear whether you are using the term "darwinism" for the theory of evolution, for social darwinism or for some mixture of the two - or simply...

it helps solve social, political, and ecumenical issues. :)

Social Darwinism is the belief that the weak and unfit should be allowed to die while the strongest/fittest should survive and flourish in society. This theory was promoted by Herbert Spencer, a 19th...