Why do different countries have different electric outlet plugs?

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3-Prong Grounded 3-Outlet Multi-Plug Adapter

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Female Plug End Grounded Plug Replacement, Horizontal 15A Amps 250V

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3 Way Plug Adaptor 13 Amp Extension Electronics Multi Socket Plug

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5A 250V Electrical Plug Adapter 3 Way Multi Outlet Receptacle Multi

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AC WORKS 1.5 ft. 6/3 STW EV Charging Adapter NEMA 6-50P 50 Amp Welder

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ETL Listed 3 Prong to 2 Prong Outlet Adapter, Polarized Ground Plug

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6-50P MALE PLUG to 14-30R FEMALE 4-PIN RECEPTACLE ADAPTER STOVE DRYER

6 Outlet Power Electrical Wall Plug Socket Surge Protector Strip Switch
6 Outlet Power Electrical Wall Plug Socket Surge Protector Strip Switch

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6-30P 3-Pin Male 220/250V Plug To 5-20R 220/250V 3-Prong Female

Hyper Tough 3 Way Outlet Plug Adapter 3 prong White For Indoor use
Hyper Tough 3 Way Outlet Plug Adapter 3 prong White For Indoor use

Fosmon 3 Outlet Wall Adapter Tap, 3-Prong Grounded Indoor AC Mini Plug
Fosmon 3 Outlet Wall Adapter Tap, 3-Prong Grounded Indoor AC Mini Plug

Why do different countries have different electric outlet plugs?
Why do different countries have different electric outlet plugs?