Generally, do the general-purpose mutual funds from the big brokers like Fidelity, Vanguard, Schwab include international companies, or is it mostly US companies?

I'm interested in investing in other countries, but I don't know if it's strictly necessary to choose a fund that says "European" or "International" on the tin as I'd like a mix. Is there an advantage or tax issue with investing in a European broker? Any recommendations there?

Thanks, folks.

The big US brokers focus stronlgy on US stocks, to get better exposure to europe, you can't get around the big EU Brokers. You can find all on justetf.com,
Many EU focused ETFs are located in Ireland; are those perhaps easy to buy? They have ISIN codes that start with IE. others are located in Luxembourg (LU). The big providers are e.g. Amundi from France, XTrackers, etc.
Example for some EU exclusive ETFs:
Amundi MSCI Europe Value Factor UCITS ETF EUR: ISIN: LU1681042518
Just received a notificiation about the new "Make Europe Great Again" ETF # HANetf Making Europe Great Again UCITS ETF Acc; ISIN: IE0007WMHDE3.

Thank you - I appreciate it. Will read up!