Once you become a resident of another state, all of your worldwide income becomes taxable in that state. 

Because you can't capture something as complex as the world-wide production and consumption of goods in a simple theory.I liken it to the study of physics.

If someone comes to me, I'll send them your way.If you need help in your search or want to verify something don't hesitate to ask.For example: I have clients worldwide and things are just as easy as I e-mail them, talking on the phone.

I serve clients worldwide.

As a US citizen you're taxed on worldwide income, so if there is any gain or other income you report that in the US and a get a foreign tax credit for whatever you have to pay Belgium.

This would be based on the type of ownership, property, and other factors.The United States taxes its citizens and permanent residents on their worldwide income.

I work for a company who employs about 43K or more employees worldwide.

Two in my area are National Corporate Housing and Oakwood Worldwide Corporate Housing. 

I learned how to make $100,000 with Mutual Funds when I was on the Oil Tankers with a Union sailing worldwide.

Since then, I keep a close on what is happening world wide in the financial market, particularly those elements that will affect real estate pricing and financing costs.