A question i have been largely fruitlessly asking in several such threads before: How do i invest in U.S. stock market being a non-American (Russian living in EU)? Without paying too much in taxes, that is.
https://www.justetf.com/uk/find-etf.html?groupField=none&sor...
You can (and should) generally buy these using a local broker in the country you live in. For tax reasons it's generally better to buy a EU-domiciled fund instead of a US-based one, but that depends on the country you live in. Here in Germany buying a US-domiciled Vanguard fund would be tax hell, but the Irish ETFs are usually very good for the US stock market.
Also, how do i protect these investments from my wife?