[sxyuan]

Investing outside your region leads to currency risk. Currency hedged funds tend to incur slightly higher costs. I don't know if there are additional tax implications as well.

Not only is historical performance no guarantee of future performance, 10 years is a pretty short time span to look back - it doesn't even take you back to the '08 recession. The US did well in the 1990s and 2010s, but both ex-US developed markets and emerging markets did better in the 2000s: https://www.ishares.com/us/strategies/international-etfs

It's good to diversify internationally, and that probably does mean holding some US equities ETF even if you're in Europe. As for what else to buy, this may be a good starting point: https://www.lynalden.com/best-etfs/

[marketgod]

You can hedge your currency risk but the U.S. dollar is the world currency. For example in Canada in 96 when you were making USD it was killing you until about 2003 but if you didn't dip into it that money doubled on its own as the USD is much stronger today.

[tasuki]

Yes, the USD is currently the foremost reserve currency. See eg https://marketcap.com.au/wp-content/uploads/2018/11/WRCurren...