Reddit reviews Social Psychology

> I don't know what you're talking about, the world at present is more peaceful and productive than it has ever been before. Life is still difficult for plenty of people, but the world is a complex place and life is a balancing act.

I'm referring to individual states, not the world in general. Also check your facts. World is at less peace today than any time in the last decade. Also proving my point with these facts:

• The broad trend in Europe has been a convergence in peace with the most peaceful, predominately those in Western Europe, declining in peacefulness, while those with weaker scores, many of them in Eastern Europe, improving.
  
• In North America, the level of peacefulness in the United States has declined for the second consecutive year and is now at the worst level of any time since 2012. Canada suffered a deterioration in its terrorism impact rating after the Quebec City and Edmonton attacks.
  
  >It's simplistic and childish to just blame all your problems on diversity.
  >
  > Like what?
  
  Diversity is pretty much the root cause for many problems the west is facing right now. Economy, politics, education, crime...
  
  Ethnic diversity also has a negative relationship with economic success. In general, the richer a nation is the less ethnically diverse it tends to be.
  
  Another unfortunate effect of racial diversity is that it sets the stage for political tribalism. People vote based on the interests of their ethnic group rather than the interests of the country at large. This likely plays a role in why Blacks and Hispanics in America are more likely than Whites to support higher taxes on the rich. Such taxes are largely a redistribution of money from the hands of White people into the hands of minorities.
  
  Ethnic diversity also has a strong negative effect on schools. For instance, one analysis of 3 million students over a 7 year period found that students had higher test scores when their teacher was of their own race (Egalite and Kisida, 2015). This was true even after controlling for poverty, past grades, and other variables.
  
  While that effect applies to all races, many aspects of diversity are especially bad for Whites. For instance, a report by the department of education looked at how the proportion of a school that is black predicted student performance on achievement tests given in the 4th, 8th, and 12th, grades. The report found that, on average, both whites and blacks did worse in school the larger the school’s black population was.
  
  Furthermore, several studies have shown that minorities are more likely than Whites to bully kids at school and that they disproportionately target White kids as the victims of their bullying (Faris, 2006; Hanish and Guerra, 2000; Tippettt et al., 2013)
  
  As if all this wasn’t enough, perhaps most damningly, research has shown, that (regardless of race), attending a school with high concentrations of minorities significantly increases a student’s probability of committing suicide (Faris, 2006).
  
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  > Humans, being a single species, generally have the same basic needs. I don't see where you're coming from on most of these points.
  
  I mean I can't believe you think I was referring to basic needs. Even so celibacy rates will only continue to skyrocket, as a result of female hypergamy and preferred race of men. It is projected that 50% of Indians in the US will be celibate.
  
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  > Yes, which is why I think it's the height of foolishness for you guys to try and sow division over arbitrary differences. What if Washington had ousted Lafayette because he was a different nationality? What if Truman had ousted Einstein? Promoting meaningless conflict is just pissing all over your own opportunities.
  
  A White American is European, just like Einstein and Lafayette. Even if Einstein was Black, I doubt Truman would pass the opportunity on a one in a million born genius. There's nothing wrong with limited immigration (though it would be rather difficult for an ethnic to integrate).
  
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  But your also missing a huge point about social harmony and functioning.
  
  The most well-known study in this literature is Putnam (2007). Putnam, a Harvard political scientist, analyzed a set of over 40 regions across the united states and looked at how ethnic diversity related to various measures of “social capital”. He held regional differences in age, poverty, crime, and other variables, constant and found that the more ethnically diverse a region was the lower its level of social capital was. In particular, Putnam found that the more diverse a community was the less trust residents reported having in their neighbors, the less people trusted local government and media, the less people voted, the less people gave to charity, the less people worked on community projects, and the fewer friends people had. Perhaps most strikingly, people in diverse communities were less happy overall and less satisfied with their lives.
  
  There is a wealth of literature showing that people tend to get along better when they are alike rather than different. Research has repeatedly found that friends and spouses are more similar, in just about every way imaginable, than average (Bryne, 1971; Myers, 2008 pg 399). Moreover, the more similar spouses are the more satisfied they tend to be with their marriage and the less likely they are to get a divorce (Luo and Klohen, 2005; Bryne, 1971; Caspi and Herberner, 1990).
  
  Experimental evidence backs up this data too. In these studies, researchers measure various traits of individuals before they meet and then see whether pre-meeting similarity predicts who ends up liking who. The finding, repeated over dozens of studies, is that the more similar people are the more they end up liking each other (Bryne, 1971; NewComb, 1961; Lee, 1996; Myers, 2008 pg 400).
  
  Furthermore, when people do succeed at forming friendships across racial lines, those friendships are far more likely to fail. One found that after controlling for sex, race, age, parental SES, family structure, immigration status, shared extracurricular activities, grade point averages, school attendance, drug abuse, friendship reciprocity, and friendship closeness, that interracial friendships were far more likely to fail relative to monoracial friendships (Rude and Herda, 2010).
  
  I mean there is so much overwhelming evidence I didn't decide to add to keep things to the point and that hopefully you might read some of it.