Answer:
A. election of a national president
Explanation: sale of land, agreements between nations and wars between nations all include relations between multiple nations, however election of a national president is only inside the nation and can’t effect boundaries.
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Through the 1920s, Britain's economy was already struggling to pay for the effects of World War I. Then, in 1929, the US stock market crashed. ... The value of British exports halved, plunging its industrial areas into poverty: by the end of 1930, unemployment more than doubled to 20 per cent.
The answer is 2/3rds of the employees