The main reason is that AC is easier to transport over long distances. AC can be transmitted at high voltages, thus reducing power losses.
Plus AC to DC conversion is pretty straightforward, as is conversion from low to high voltage using transformer.
If you want more details, you can search on the internet.
If you still want more details, you can explore how in America and China, they are transporting DC in some cases with power losses less than AC!
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'You only live twice. Once when you're born and once when you look death in the face'
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