I have a link to the racist handbook for you. This tweet says it all. But if you're younger than 50 you possibly won't understand the significance of this tweet.
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There you go, "If you hate our Country, or if you are not happy here, you can leave!" This is not a new or imaginative phrase on Trump's part. This phrase has been a political approach for decades. It's meant to appeal to ordinary people, those people that feel they've been left behind and believe that their concerns are disregarded by established elite groups. It's an appeal to the populous that bitterly resents people that they believe are living 'on the dole', people that are sucking up their tax dollars. The phrase is an appeal to the red states who bitterly complain that black people are lazy and just want to stay home, not work and collect entitlements. And yet, the majority of those 'entitlements' are actually going to red states.
That statement, "go back to where you came from" is pure, unadulterated racism, you don't need a handbook.