1. How did the Gold Rush Impact the United States?
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The Gold Rush impacted the US by

The Gold Rush impacted the US by radically transforming California, the United States, and the world. The significant increase in population and infrastructure allowed California to qualify for statehood in 1850, only a few years after it was ceded by Mexico, and facilitated U.S. expansion to the American West.

Explanation:

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.