A two-party system refers to a party system where only two major political parties are dominating the race in government position. A multiparty system is where a number of political parties can participate in a national elections and have equal chances of gaining control in the government offices.
The US is currently using the two-party system where the house of representatives is composed of the democrats and republicans.
One example of public policy that was based on Darwinian thought is that of eugenics. Eugenics is the idea of trying to improve the genetic quality of a population by not allowing the reproduction of certain groups, and encouraging the reproduction of others. Although the concept of eugenics predates Darwin, it gained scientific support after his theory of evolution.
The concept is heavily disputed. Moreover, it carries negative associations due to its identification with the policies of Nazi Germany. However, eugenics was influential in a variety of regimes during the 20th century. In America, this was embodied in the American Eugenics Society, founded in 1922.
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Texas claimed the Rio Grande as its southern boundary, while Mexico insisted that the Nueces River was the boundary.
