Answer: The term color line in history means racism. This term was used to reference racial segregation that existed in the United States after the abolition of slavery.
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It was the Aryans or in other terms German race of people were to be like the masters of other races, other races than that were inferior to him and something like that is like a fly on your food, u want to get it off so same with Hitler, he killed lots of Jews, families, homosexuals, and more since they weren't part of his race.
Karl Marx once said; "I am not a Marxist!". He also once called his adherents "useful idiots". Karl Marx presented a strategy in communism much of which can be found in his book, Das Kapital.
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The biggest one is speculation on the market. Many would buy stocks on margin, say only meeding 10% of the share amount to buy a share of stock. So great quantities of stock were able to be bought without necesarily having the money to legitimately purchase them.
It must be c the sinking of the lusitania