you'll need a work visa. contact http://www.globaltransitinc.com/ for more information, they specialize in this sort of work.
US citizens can work in almost any country if they have the proper visas. These countries can include Canada, Great Britain, France, Spain, and many others.
I think that Chinese people were not allowed to become US citizens.
Yes dual citizenship is allowed for US citizens.
No, US citizens are generally not allowed to travel to North Korea due to travel restrictions imposed by the US government.
No, US citizens are generally not allowed to visit North Korea due to travel restrictions imposed by the US government.
Yes, US citizens can work in Germany with the appropriate visa and work permit.
A US citizen can remain in the UK for 6 months on a tourist visa, however not allowed to work.
No, US citizens cannot work in the UK without a visa.
No, US citizens are generally not allowed to visit North Korea due to travel restrictions imposed by the US government.
Citizens of the US are not allowed to travel to Cuba under normal circumstances.
I do not believe there is any prohibition against it. If Canadian citizens can (and DO) own property in the US I have every reason to believe that US citizens can own land in Canada.
Yes, US citizens can work in the UK, but they may need to obtain a visa or work permit depending on the type of work and length of stay.