the South African government, including an arms embargo. However, these sanctions were seen as weak by anti-apartheid activists, and as insufficient by the president's opponents in Congress, including 81 House Republicans. In August 1986, Congress approved the Comprehensive Anti-Apartheid Act, which included tougher sanctions. Reagan vetoed the act, but this was overridden by a bipartisan effort in Congress. By 1990, under Reagan's successor George H. W. Bush, the new South African government of F. W. de Klerk was introducing widespread reforms, though the Bush administration argued that this was not a result of the tougher sanctions. Free trade During his 1980 presidential campaign, Reagan proposed the creation of a common market in North America. Once in office, Reagan signed the Trade and Tariff Act of 1984, which granted the president "fast track" authority in negotiating free trade agreements. In 1985, Reagan signed the Israel–United States Free Trade Agreement, the first bilateral free trade agreement in U.S. history. In 1988, Reagan and Canadian Prime Minister Brian Mulroney signed the Canada–United States Free Trade Agreement, which greatly reduced trade barriers between the United States and Canada. This trade pact would serve as the foundation for the North American Free Trade Agreement among the United States, Canada, and Mexico. International travel Reagan made 25 international trips to 26 countries on four continents—Europe, Asia, North America, and South America—during his presidency. He made seven trips to continental Europe, three to Asia and one to South America. He is perhaps best remembered for his speeches at the 40th anniversary of the Normandy landings, for his impassioned speech at the Berlin Wall, his summit meetings with Mikhail Gorbachev, and riding horses with Queen Elizabeth II at Windsor Park. Age and health At the time, Reagan was the oldest person to have served as U.S. president. Reagan's health became a concern at times during his presidency. Former White House correspondent Lesley Stahl later wrote that she and other reporters noticed what might have been early symptoms of Reagan's later Alzheimer's disease. She said that on her last day on the beat, Reagan spoke to her for a few moments and did not seem to know who she was before returning to his normal behavior. However, Reagan's primary physician, Dr. John Hutton, has said that Reagan "absolutely" did not "show any signs of dementia or Alzheimer's" during his presidency. His doctors have noted that he began exhibiting Alzheimer's