Yes, provided they came into the country legally. If one or both are below 18 years of age a special permit is needed, though. You also need to book time at the town hall - and in case the marriage involves a divorcee you will have to submit divorce documents in advance.
There are no states in Denmark like the US. The capital city, if that is what you are asking, in Denmark, is Copenhagen, or København in Danish.
The distance is 8,779km.
No one 'makes' copenhagen. It's a city. Well, if you're referring to the brand of chew, it's made by the US Smokeless Tobacco company.
If they are married in Denmark...than yes
yes
You would need to get married in Denmark and then file for Permanent Residency here in the US. You can get an application by calling INS.
no
Book a flight and a hotel....... There are no visa requirements for US citizens to enter Denmark so as long as you have a passport, and the funds to pay for a flight and accommodation then you are all set.
Tens of thousands
No. Marrying in a different country doesn't affect citizenship.
Yes, US citizens can get married in Canada. They must meet the legal requirements set by the Canadian government, which may include providing certain documents and following specific procedures.
If you are both United States citizens it is not illegal, wherever you are married.