Are International Contracts Effective and Enforceable?

Flag of England (Yes, fellow Americans, there is an English flag separate from the UK flag – do you see the relationship?)
This post reproduces, almost verbatim, a Quora question and my answer. Q. How effective and enforceable are contracts between parties located in the United States and England?
A. Such agreements can be effective and enforced – agreements between parties in different countries are entered into routinely. (more…)