What if you live in a country that where polygamy is legal & to relocate to an area where it's illegal?

Only the marriage to the first wife would be valid.

In the "new" country.. Those marriages would be considered void..

However, in the "old" country, you would still be legally married.. Youd have to go thru the divorce process in your old country

Simply identify only one of the wives as the legal wife. Happens all the time.

The new country doesn't recognize your extra wives.

Your extra wives don't get preferential treatment of any sort. This is why George Bush's rich arab friends had to buy Millionaire visas for their extra wives to get them into the US.

It's easy to divorce them in Turban-land; "I divorce you!" In America you'll have to decide just one of them is your "real" wife and the others will just be paramours with no legal relationship to you. Remember, you can have as many families as you want in America but just one legal wife.

No, you don't have to divorce your "extra wives". Because in the new country, they would not be recognized as wives, and you can't divorce somebody who isn't your spouse. As far as the new country is concerned, they are just some women that happened to live with you.

In the Muslim countries that allows/encourages that it is only in their religious law, the only 'marriage' that is accepted in 1st world countries is the first marriage...........so that is the only one that could get a spousal dependent visa, any others would have to remain in their own country and/or for those countries which allow other dependents ( such as children however many only allowed up to 18 and single) proof would be asked for of any other dependents to be able to 'potentially' get a dependent visa