The NAFTA agreement entered into force on January 1, 1994 and was signed by President George H.W. Bush and approved by Congress. It eliminated most trade barriers between the US, Canada, and Mexico and established rules for trade and investment. Since NAFTA, trade between the three countries has increased significantly, though it has also resulted in some job displacement and increased inequality within Mexico. Issues now include proposals to deepen economic integration between the three countries and implications of the proposed Trans-Pacific Partnership trade agreement.