I'm looking for a dataset containing the following:
- for each country, number of weddings according to the spouses' nationalities
- if possible, yearly data and % of divorces.
For example, here is such dataset about Koreans:
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The United Nations Statistics Divisions publishes tables on marriages per country. While they do not break it down by nationality, they do provide a variety of demographic data.
The BLS also publishes tables on marriage that contain some ethnicity information for the US: