The dawes severalty act of 1887 failed because

The 1887 Dawes Act imposed a new system of land managing in which the traditonal tribal ownership of land could no longer be used. Momaday accused it of being uprooting for Native Americans and to destroy their traditions.

Explanation:

southerners, for their part, considered brown a terrorist. they felt threatened by northerners' deification of brown and worried about the potential for other, similar armed insurrections.

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.