One of the obligations of the federal government to the states is to ensure a republican form of government
The Supreme Court established the rule in Luther v. Borden 1 that disputes arising under this provision are political, not judicial, in nature and that "it lies with Congress to determine whether the government is the established one in a State... as well as its republican character."
In Texas v. White 3, it was decided that the President's decision to establish temporary governments after the war was justified, if at all, only as an exercise of his authority as Commander-in-Chief and that these governments were only to be regarded as temporary ones to carry out governmental duties while Congress considered its options.
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South Asia, Australia, Europe, the Americas.
1. D. Inca settlements were difficult to find and reach because they were build at high altitudes on rough terrain.
Inca civilizations were well hidden and protected from outside influences due to their location high in the Andes Mountains of South America. It took the Spanish a while to find them, though diseases reached the outlying settlements even when the Spanish did not.
2. D. infectious diseases and drought
The Maya civilization experienced a lengthy and extreme drought that led to widespread starvation, which reduced their population and influence over the region long before Europeans arrived in Mesoamerica. The Inca and the Aztec populations were wiped out by the infectious diseases the Spanish conquistadores brought with them.
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