A lot of people express their surprise about "other nations discovering AU, NZ, US" etc.

You do understand homo sapiens did not evolve separately on these different continents/lands right?

The actual discovery was when the first homo sapien settled in US, AU, NZ etc.... Of course some cultures managed to travel to these lands long before our history records tells us. Native Americans are not a separate species of homo sapiens, they did not evolve there separately.