The US Constitution divided power in three independent branches: the Legislative Branch, the Executive Branch, and the Judicial Branch. This separation applies to the federal government and also to the government of each of the States.
The main aim was to keep power balanced. The Constitution also established the 'Checks and Balances' system, through which each of the powers can check on the others and prevent that they exceed their functions. None of the three powers could gather such a large amount of power to rule over the others, without being punished.
The answer in the question provided is letter b, lack of
industrialization. It is because developing nation or country usually involves
of having industrial bases to be less develop than of the developed countries
in which lack industrialization is one of the things found in a developing
nation.
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The Harlem Renaissance started in the late 1910s and went through the 1930s. Its causes are all localized in the many transformations America was going through the 1920s.
The age of anxiety was characterized by growing fundamentalism, blatant racism with the rebirth of the Ku Klux Klan and the mob attacks on black veterans of World War I known as the Red Summer, nativism, hatred of immigrants, hatred of non-Catholics, anti-communism that is known as the First Red Scare caused by the October Revolution (1917) in Russia, hatred for anything that looked like leftism and defense of worker's rights.
Many of these things were caused by and/or impacted by growing industrialization, consumer culture, government's encouragement of business. It was during this time that the Great Migration started: the event when millions of African Americans migrated towards the North to cities like New York, Detroit, Chicago, and Philadelphia.
All this together created a scenario of growing mass culture that generated more space, opportunities, and the need for black people to finally express themselves in art. It was in the works of the Harlem Renaissance that black authors defied racism and the lynchings they were suffering in the sphere of popular culture.