Major drivers of Irish migration to Australia:
Potato blight caused starvation, disease, eviction. ~1M died; ~2M fled. Australia was a major destination.
Discoveries in Victoria and NSW drew thousands hoping for wealth; many stayed.
Steamships cut voyage time from months to weeks, reducing cost and mortality.
Australia's relative tolerance attracted Catholics escaping Penal Law legacy.
Colonial governments subsidized fares for laborers, domestic workers, single women.
Personal factors (family, adventure, chain migration) also played roles. Irish became a foundational demographic in Australia.