Your question: "Why is racism still alive?"
One reason is because of incessant propaganda from political hacks and the video infotainment industry to convince children and adults that there is race. Once people believe that, they tend to assign arbitrary characteristics to there arbitrary categories of race. Thus you have racism.
Typical race schemas are based on arbitrary points of similarity and dissimilarity in visible phenotype. There are also race schemas based on culturally acquired ethnicity, e.g., native language or religious affiliation. Some race schemas are a combination of both. In any case, they are all ultimately ill-conceived and of no biological significance. Since the discovery of the molecular basis of inheritance it has been shown that human beings are all the same species. At the sites below you can learn where we came from, and more:
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http://www.ted.com/talks/nina_jablonski_breaks_the_illusion_of_skin_color.html
"MODERN HUMAN VARIATION... An Introduction to An efIntroduction to Contemporary Human Biological Diversity"
Created and maintained by Dr. Dennis O’Neil
Behavioral Sciences Department, Palomar College, San Marcos, California
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http://anthro.palomar.edu/vary/Default.htm
"In human beings, it is simply not possible to delimit clearly defined races that reflect biologically differentiated and well-defined groupings. The reason is simple: different groups of people have constantly intermingled and interbred with one another during the entire course of history. This constant gene flow has prevented the human species from fragmenting in highly differentiated subspecies. Those characteristics that are differentiated among populations, such as skin color, represent classic examples of the antagonism between gene flow and natural selection.” -- Biology 8th Edition, by Raven, Johnson, Losos, Mason, Singer [McGraw-Hill: 2008] page 714.
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Something that many people miss because they have been staring at it for so many years without considering whether nor not it is true is that the video infotainment we euphemistically refer to as news and entertainment promotes racism.
"Black-ish (stylized as blackish) is an American sitcom starring Anthony Anderson and Tracee Ellis Ross, that debuted on ABC during the 2014–15 television season. The single-camera comedy centers on an upper-middle-class African-American family. The series premiered on September 24, 2014."
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http://en.wikipedia.org/wiki/Black-ish
" ‘Fresh Off the Boat’ is a comedy series… that is inspired by the life of chef and food personality Eddie Huang and his book ‘Fresh Off the Boat: A Memoir’. It is the first American television situation comedy starring an Asian-American family as protagonists to air on network primetime since Margaret Cho’s ‘All American Girl’, which aired for one season in 1994… The show debuted [on ABC] with two preview episodes on February 4, 2015."
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http://en.wikipedia.org/wiki/Fresh_Off_the_Boat
The latter citation is quite telling about how effective racist propaganda in so-called mainstream media is: There is no universal Asian phenotype or language or culture by which one can justify the term "Asian-American family". The truth of the matter is that Asia is a large place where over half of humanity lives, about 4.4 billion people. It extends from the southern tip of Yemen to the northern tip of Russia. Many people living there are so-called white people, others not.
"This is a list of Asian countries and dependent territories by population, which is sorted by the mid-year normalized demographic projections.... Total: 4,372,000,000"
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https://en.wikipedia.org/wiki/List_of_Asian_countries_by_population
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Racism is a constant feature of domestic political propaganda from some persons and their party.
For example:
"... my grandmother... is a typical white person. If she sees somebody on the street that she doesn’t know - there’s a reaction in her that’s been bred into our experiences that don’t go away and sometimes come out in the wrong way and that’s just the nature of race in our society." -- Barack Obama, 2008
by Dan Gross, 21 March 2008, Philly.com
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http://www.philly.com/philly/blogs/phillygossip/Obama_on_WIP_My_grandmothers_a_typical_white_person.html
"There are very few African American men in this country who haven’t had the experience of being followed when they were shopping in a department store. That includes me. There are very few African American men who haven’t had the experience of walking across the street and hearing the locks click on the doors of cars. That happens to me -- at least before I was a senator. There are very few African Americans who haven’t had the experience of getting on an elevator and a woman clutching her purse nervously and holding her breath until she had a chance to get off. That happens often." – Barack Obama, 19 July 2013
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http://www.whitehouse.gov/the-press-office/2013/07/19/remarks-president-trayvon-martin
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Little children may believe Obama’s paranoid psychotic race rants, but an adult would have to be a paranoid psychotic racist to believe and act on them, like Barack Obama, or like this guy, a former impressionable young man now deceased: " 'I’m Putting Wings on Pigs Today,' a person believed to be the gunman wrote. 'They Take 1 Of Ours . . . Let’s Take 2 of Theirs,' the post continued, ending with, 'This May Be My Final Post.' "
-- Ismaaiyl Brinsley, 20 December 2014, New York Post
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http://nypost.com/2014/12/20/2-nypd-cops-shot-execution-style-in-brooklyn/
"18-year-old man bullies, robs store owner; soon after same man assaults cop for warning him against jaywalking, gets shot to death. Race riot ensues."
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https://en.wikipedia.org/wiki/Shooting_of_Michael_Brown
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