The rules for investments etc. do not change because you are living abroad or married to a non US citizen. All the provisions that are available in the tax code are available to you as a US citizen. US-taxman handles these items regularly.

Think of it! With the exception of the United States, when a person moves away from the country and establishes tax residency in another country, they will no longer be taxed as a resident of the first country.
But in the case of the United States: If a U.S. citizen moves from the United States and establishes tax residency in a new country: (1) they will STILL be taxable as a tax resident of the United States (2) they will be subjected to a separate and more punitive system of taxation! (3) they will have to engage in financial planning according to the rules of the tax system where he resides.
Read full article: www.taxconnections.com/taxblog/how-do-u-s-tax-rules-constrain-the-investment-choices-of-us-taxpayers-living-in-australia/