Which historic phenomenon had the most significant impact on early socialist thinkers?

The industrial revolution

Explanation:

during the industrial revolution, the demands for human labors was massively increased. Since there was no government regulation to protect workers at that time, a lot of them were treated unfairly by business owners (not enough salary and horrible working condition).

This gave a significant impact on early socialists thinkers to fight for those abused workers.

genetics is the study of how dna works, the methodologies defining the new recent technologies allow scientist to have a panoramic view of the entire dna landscape, especially how genomes interact with their environment, including off course, factors outside their organisms.

thus is very possible the existence of both scenarios, where populations of isolated individuals have different genetic traits, and share traits related to genetic mutation, due rats can easily travel overseas using human transport channels. so scientists could get a vast number of data, including human interaction, evolution of rodents, health development, spread of infections, development of new organisms, how genomes evolve in different environments and so on.

wait history, who want to talk about history, boring.