The Law or Torah I believe.
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One reason conquistadors failed to establish colonies is that the Natives kicked them out. Many of the aboriginal people were very powerful and could easily get rid of the conquistadors.
Conquistadors could also run out of resources. Nothing lasts forever, and if they couldn't obtain enough resources while exploring and settling it would be hard to establish a colony easily.
There could also be dangerous things that could hinder the settlements such as wild beasts, natural events, and diseases.
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<span>Tens of thousands of sub-Saharan Africans try to cross the Mediterranean each year because of various reasons: many tries to escape a life built on poverty and misery, other tries to get out from a very unstable country were they might not survive long or were there is a war in act, others tries to find a better life in the European countries, because there are no resources left in their own,
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These refugees are commonly portrayed as dangerous people, perhaps people that come in the European country to stole jobs from Eupoean, or to take bits of help from the country there are in without contributing to the country, or they are criminals that do not want to work or pay taxes, or sometimes they are also portrayed as terrorist.</span>