Slavery was justified by saying that it was 'natural' or 'beneficial' and that it was part of gods plan and to interfere was wrong. Also, people thought that slavery taught people how to live their lives if they thought they lacked the ability to. Mainly also because it was legal, however this is not a very good argument because it can be legal but unethical. Abolishing slavery would threaten the structure of society is another good point.
World war 1 began on 28 July 1914 and ended on 11 November 1918, so the years when WW1 lasted were 1914, 1915, 1916, 1917, 1918 it lasted exactly 4 years 3 months and 2 weeks :)
I did three of the problems
Answer:
Adam Smith is associated with CAPITALISM, Robert Owen is associated with SOCIAILISM, and Karl Marx is associated with COMMUNISM.