how to make a country as default when selecting it from the country LOV

Summary:

When creating a classroom in the learning administrator work area, i want to add a new location as the classroom. When I click the country LOV to select a country, 'United States' is dispplayed by default. I want to know if I can change this and enter another country as the default value:

I also want to know if the city LOV in the address details can be modified to include 'Others' as a value:

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