Explanation:
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The thing which was a major factor that threatened the major unity in the United States in the mid-19th century was:
<h3>The Great Depression</h3>
This refers to the period around 1929 in the United States which has a profound effect on the national economy.
This led to the failure of many banks, increase in unemployment and high deflation rates which all threatened the national unity.
Read more about Great Depression here:
brainly.com/question/441267
According to google translator apartheid is " (in South Africa) a policy or system of segregation or discrimination on grounds of race" so after all the National Party in South Africa got the power, all White government suddenly start forcing policies of racial segregation in the worst system apartheid, moreover, the system was discrimination against the Black society that was existed in South Africa between 1948 and 1994 . According to Wiki the "economic legacy and generational effects of apartheid continue to this day."It was like master and slave way of living, in which the master gets the most benefits and the slave works hard to get a small amount of wage or money to survive in hardship.
Wheres the wrest of the question?