systems of state regulation pose safety concerns. As a result, the High Court held that all aviation has an interstate character, placing it within Commonwealth legislative power. In 1937 a referendum was submitted to the people giving the Commonwealth power over aviation, and that the referendum was rejected by the people. The rejection of a power by the people has never persuaded the Court that the Commonwealth should not exercise the power. Another example concerns intellectual property. Although the Constitution gave the Commonwealth Parliament power over "copyrights, patents of inventions and designs, and trade marks", the enormous growth of electronic media content has given this power a much wider scope than could possibly have been envisaged at Federation. New powers The Commonwealth power has been extended by four constitutional amendments. An amendment in 1910 and an amendment in 1928 allowed the Commonwealth to take over and manage state debts. An amendment passed in 1967 gave the Commonwealth power over Aboriginal affairs, which has had a significant effect particularly in the pastoral and central regions of Australia. An amendment passed in 1946 gave the Commonwealth power to provide a wide range of social services. This included unemployment and sickness benefits, maternity allowances, child endowment, and medical and dental services. Apart from defence, social services is the largest area of Commonwealth expenditure. Along with the grants power, it is the basis for the Medicare scheme of universal health insurance. The High Court decided that the corporations power was not broad enough to cover incorporation itself. This decision threatened the validity of Australian companies incorporated under commonwealth law. The states used 'the referral power' to refer the power over incorporation to the Commonwealth Parliament. The external affairs power The Constitution gives the Commonwealth Parliament power over "external affairs". Originally this power had little content, because Australia's foreign relations were managed by the United Kingdom. As Australia gained independence and international personality, so did the significance of this power. Australia's relations with other countries fall directly under the subject of external affairs. It includes relations with other British Dominions and further extends to relations with international organisations. The pursuit and advancement of friendliness with foreign governments is another vital aspect under the external affairs power. The High Court has held that the power covers the regulation of conduct that takes place outside Australia, suggesting that mere externality to Australia could enliven the power. In