The question "Why did the Mexicans come to Australia?" contains a false premise: there has never been a significant wave of Mexican immigration to Australia. The Mexican-born population in Australia is small—approximately 5,000-6,000 people (2021 Census)—representing a tiny fraction of Australia's 30% foreign-born population.
Contemporary migration consists mainly of:
Historical context: Unlike Chilean, Argentine, or Uruguayan communities that grew from 1970s-80s political exiles, no comparable Mexican political migration occurred. Mexico's geographic distance, lack of colonial ties to Britain, and different economic trajectory meant no mass migration pathway developed.
Bilateral ties are growing: trade (beef, mining, education), diplomatic cooperation (G20, MIKTA, APEC), and cultural exchange. But people-to-people links remain modest compared to other Latin American communities in Australia.
If you're researching Mexican migration, look to the United States (10.9M Mexican-born), Canada (~130,000), or Spain (~600,000)—not Australia. The Mexican-Australian story is one of small, skilled, contemporary movement—not historical mass migration.