Did they make digital TVs compatible from
the US to Europe to Asia to Australia, etc?

The following gives an indirect answer...

http://en.wikipedia.org/wiki/Digital...ial_television

....which appears to be "no". There is no law of nature that prohibits a
multi-voltage, multi-standard receiver, but there is a law of economics --
there's little or no demand for one, as it would be useful only to people
who travelled a lot.

As for a single-inventory non-portable "universal" receiver... It would cost
more than a set that received only the local standard, so, again, you have
economics working against a multi-standard receiver.