Usually, but there are exceptions. States are not required to recognize a marriage performed in another state, if that marriage is illegal under their state laws. For example, most states will not recognize a same-sex marriage, even if the marriage was performed legally/is recognized in the state it occurred in.
The "full faith and credit clause" of the Constitution. Note: states are not actually required to recognize a marriage that is illegal in their own states (which is why states that do not allow gay marriage won't recognize a gay marriage from another state)
the Full Faith and Credit Clause
The states have reciprocity as regards marriage (each respects the others' laws) unless, of course, you are gay.
Most states due not allow even adopted siblings to be married. Legally they are considered no different then blood related siblings.
18 * A married person in the United States is considered legally emancipated regardless of their age. Additionally the U.S. recognizes all legal marriages regardless of where they take place. Therefore if the person was legally married in Malaysia they are legally married in the U.S. and may leave their parents' home and the U.S. if they choose to do so.
If you are married under the laws of another country, you are considered married throughout the world. If you have one wife, you cannot legally marry another. It is bigamy and is against the law in the United States.
If you get married, yes, you can live with your husband and you are considered emancipated. Getting married a 15 is not allowed in many states, you have to be at least 16 with parental consent. And for under 16, those states that will allow it often require a court order.
Yes.
In US law a common law marriage does have some legal standing; but is not considered a legal marriage. In most cases a legal marriage anywhere in the world is considered legal in the United States. Therefore if Mexico considers you to be married then the US does too.
Yes, you are
In the United States you must apply for a marriage license and then have someone perform the ceremony in order to enjoy the full legal benefits of marriage.
Only in states that allow 19 year olds to gamble legally. It makes no difference to the laws on gambling that a person is married or not.
If you are in the United States, no. If you are in another country, please check the age in which you are considered legally an adult. Whatever age that is, you do not need your parent's permission in order to get married.