The 2009 outbreak of swine flu (that specific H1N1) was 1st detected in 2003 from Hongkong and not Veracruz Mexico in 2009.
Movement of live pigs between Eurasia and North America seems to have facilitated the mixing of diverse swine influenza viruses, leading to the multiple reassortment events associated with the genesis of the S-OIV strain.*

Sw/HK/78/2003

https://www.nature.com/articles/nature08182

If anyone is interested you can get the DNA data for yourself:

Full genome sequences of these viruses are available for download at GenBank under accession numbers GQ229259–GQ229378.

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"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course