In some countries only citizens may own property. So a decision about naturalisation is not simply a question of 'national loyalty'. People are more on the move now than at any time in history. Only Canada, the USA and Australia maintain regular immigration programs. Most Western countries have put up barriers.
Visas are the first line of defence.
Anyone who is not a citizen needs a visa to come to Australia, either as a tourist or a migrant. Meanwhile nearly 30,000 citizens or residents will leave to live and work elsewhere. Over 2 million tourists will visit Australia this year. This number will increase as we approach the Sydney 2000 Olympics. Economic critics of immigration say that with so many already unemployed, Australia cannot accept more people.