The greatest negative impact of colonization was the exploitation of the natural resources by foreigners which did not benefit the local communities, but instead the colonizers
The colonial governments introduced improved medical care, and better methods of sanitation.
Shortly after Muhammad's death, God (Allah in arabic), wrote the Koran/Quran.
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It's because they provide communication and data security
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I can only answer a few Sorry :( One of them is they had trouble with people moving to different countries
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