You can't finance other countries by running a trade deficit. For example through the Marshall plan US ran a larger trade surplus than otherwise possible to hel

You can't finance other countries by running a trade deficit. For example through the Marshall plan US ran a larger trade surplus than otherwise possible to help other countries rebuild. That's an example of financing others. The US trade deficits do provide other countries a different public good, namely a common medium of exchange, a.k.a. currency. In turn other surplus economies are financing the US. How sustainable it is depends on the interest rate. Right now it is close to being not sustainable due to the high (real) interest rate.