How did party politics affect foreign policy ?

Party politics and ideologies are clearly influential in the development of nations' foreign policy. Thus, for example, the internal position of the ruling political party determines with which countries it will link through political and commercial alliances: for example, a left-wing political party that comes to the government will link itself better with countries with socialist or communist governments , while maintaining cold or even tense relations with countries with free-market or right-wing governments.

In America, for example, republican governments have historically had good relations with Great Britain, France and other NATO nations, while they have maintained tense relations with nations with leftist governments.

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.