The best and most correct answer among the choices provided by your question is the fifth choice.
All of the given choices are correct concerning <span>the constitutional structure within the Articles of Confederation (1781-1789).</span>
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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
2x2 = 4
5x5-4+6 = 27
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