Ferdinand Magellan was a P<span>ortuguese explorer sponsored by Spain who tried to sail around the world.
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Answer:
Disagreements over federal laws, goverment and matters, are the most likely cause for secession in Modern America.
For example, if the federal government passes a law that taxes certain economic activities very high, and these activities are very important for a particular state, that particular state could start a secessio process, although such process would not be likely to succeed.
Another possibility is if a state inhabitants simply become nationalist and start separatist movements.
Answer:
The Incans did not rely on trade, but the Egyptians did. The Incans collected taxes, but the Egyptians did not. The Incans used to barter, but the Egyptians did not. The Incans did not have paper money, but the Egyptians did.
The 13th Amendment abolished slavery
The 14th Amendment states all people born or naturalized in the United States are citizens
The 15th Amendment gives everybody the right to vote no matter that citizen's race or color
All of these succeed because they allowed all African Americans to be free from slavery and granted them the right to citizenship. All Amendments are still enforced to this day and will never be removed from the Constitution.