If by "illegal" you mean "against the law," then none. There is no state in the US where same-sex marriage is considered a crime. In fact, in most US states, same-sex marriage is legally recognized. (See related questions below: "What US states have legalized same-sex marriage" and "What US states have banned same-sex marriage.")
There are many states which consider slingshot to be illegal. However, I had read somewhere that Massachusetts is one place where it is legal.
It is not illegal to own the Anarchist's Cookbook in the United States. Many people think it is a banned book because of the things that are talked about in it are illegal to carry out. Something is only illegal once you do it (not reading it or thinking about it).
Yes, many U.S. states banned same-sex sexual activity until 2003. Today, there are still many countries where it is illegal to be gay or lesbian.
They are illegal on airplanes (passenger and cargo). They are also illegal in most if not all US states. It has something to do with the phosphorous compound that is used.
it's illegal everywhere in the United States, unless if you get a Medical Marijuana License
This varies widely between states since they all have their own laws and many are really old. I read that in Washington it's illegal to have sex in any other position than the missionary. I doubt anyone cares. Sodomy's legality also varies between states. In Minnesota it's illegal to have sex with a live fish. Intercourse before marriage is illegal in Georgia. Oral sex is illegal in 18 states. In Virginia it's illegal to have sex with the lights on. It's illegal to talk dirty during intercourse for husbands in Willowdale, Oregon. It's illegal for a man to shoot of a gun when the woman has a orgasm, in Connorsville Wisconsin. ...and many many more.
Same-sex marriage is legal in all 50 US states.
In most states if there is no license, there is no marriage. Some states allow a common law marriage when people have been living together for many years.
none
Yes. In many cultures it is not only accepted but encouraged. In many countries, it is illegal.
Yes, if he then becomes a legal resident There is nothing illegal about marriage, however, since the other one is an illegal immigrant, they are not likely to be granted citizenship simply because of the marriage. The two could be separated for many years.
There are about 14 states that currently still ban same sex marriage.
If you are LEGALLY married in any country, that marriage will be recognised in all other countries.The problems come in cultures where bigamy (marriage to more than one person at a time) is legal in the home country but illegal in many other countries.
In the US it is legal in 6 states for first cousins to marry, under certain circumstances. See link.
In India, as per the Hindu Marriage Act, polygamy is considered illegal.
Homosexual marriage is illegal in Alexandria, Virginia.
Same sex marriage and homosexuality are illegal in Uganda