When Spain and Portugal joined the European Community (EC) in 1986, The United States feared that a result of this change might be a shift in demand for agricultural products by Spain and Portugal away from the United Sates and toward other EC community members. In response, the United States threatened to impose stiff tariffs on a variety of exports of the rest of the EC to the United States. Using offer curve diagrams for (a) the United States and Spain/Portugal, (b) Spain/Portugal and the rest of the EC, and (c) the United States and the rest of the EC, illustrate and explain the effects of these potential events on the terms of trade and volume of trade.