In US law you can only be legally married to one person at at a time. In most cases the first marriage is considered legal; and any subsequent marriage while still married to the original spouse, is considered invalid.
The legal process by which citizens of one country become citizens of another.
naturalization
If you mean the Congress of the Unites States of America, then that congress has the power to determine how non US citizens can (if they want) become US citizens. It does not have power to determine the rules for citizenship for any other country.
Yes, any country can do that. You'd need to contact the government agency that handles immigration in the specific country you're interested in to find out if they do do that, and what you need to do to legally start the process.(The United States, for example, does not. Spouses of citizens become "permanent residents," they are allowed to stay in the country, but they are not citizens and cannot, for example, vote. They must go through the naturalization process if they want to become citizens.)
yes because they were not born in that certain foreign country
So that they could receive the rewards of being citizens of that country, like, for example, voting.
Yes, as long as you are a U.S. citizen from birth. For example, if both of your parents are U.S. citizens and you are born while they are on vacation overseas, you are still a U.S. citizen from birth.
Type your answer here... Naturalization is the process by which people can become citizens of a country they were not born in.
One can become a citizen of other country throuth Naturalization.
Because there are financial benefits to becoming a citizen of a country.
Become independent country
No. One of the selection criteria for any of the Australian of the Year awards stipulates that nominees must be Australian citizens. They can certainly have come from another country, but they must have become Australian citizens in order to be nominated for an award. See the related link below for the lists of criteria.