The origin of the virus can be tracked by full genome sequences and this can pinpoint the origin of the virus.Here is an example from Israel.
Full genome sequences are increasingly used to track the geographic spread and transmission dynamics of viral pathogens. Here, with a focus on Israel, we sequenced 212 SARS-CoV-2 sequences and use them to perform a comprehensive analysis to trace the origins and spread of the virus. A...
www.medrxiv.org
From this they could deduce there had been multiple introductions of Covid into Israel.Those of US origin appeared to be more infective.
Then there is this site which tracks all mutatations.And there are a lot.

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A very busy picture but the thick grey line furthest to the left they say with 100% confidence arose in Asia and is the original Wuhan virus.
The thick brown line is the strain that originated in the UK and the origin of other European variants.
To get the interaction for identifying this is the web page.
nextstrain.org
The picture for North America is more confusing as you have to know the variation as they don't hilight the origins of the particular virus on this picture.But the interesting part is the Eastern USA is predominantly the strains of European origin whereas in the west it is predominantly the Wuhan virus.They have shown at least 75%of cases in the USA came from NYC.

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It is also thought that the European variants had higher viral replication rates and patients with this variant spread the infection more rapidlyIn the Israeli report cases from the USA spread the infection up to 80 times the rate of others.For a couple of reasons I assume most from the USA were from the Eastern states.
In Australia the original cases were the Wuhan virus but as more cases came in from Europe and USA the European variant became more prevalent.Fortunately by then Quarantine,testing and contact tracing had been ramped up.So we were lucky because we could close our International border,the original variant was less virulent and we had our act basically in place by the time the more virulent variant arrived.
I have searched but nothing I can find suggests which clusters were caused by which variant.Although the NWRH cluster first began with a Ruby Princess case there were Americans and europeans aboard who possibly could have introduced their variant.