Should Social Security benefits be portable between Countries? This issue could be a stealth attack

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2. Our Social Security has had agreements with other countries' comparable programs for years.

I'm not sure how it works in detail.

Since the late 1970's, the United States has established a network of bilateral Social Security agreements that coordinate the U.S. Social Security program with the comparable programs of other countries. This article gives a brief overview of the agreements and should be of particular interest to multinational companies and to people who work abroad during their careers.

International Social Security agreements, often called "Totalization agreements," have two main purposes. First, they eliminate dual Social Security taxation, the situation that occurs when a worker from one country works in another country and is required to pay Social Security taxes to both countries on the same earnings. Second, the agreements help fill gaps in benefit protection for workers who have divided their careers between the United States and another country.

Agreements to coordinate Social Security protection across national boundaries have been common in Western Europe for decades. Following is a list of the agreements the United States has concluded and the date of the entry into force of each. Some of these agreements were subsequently revised; the date shown is the date the original agreement entered into force.

https://www.ssa.gov/international/agreements_overview.html

They are almost all European countries other than Canada, Japan and South Korea.