WASHINGTON - Early in his first term, President Bush (news - web sites) proposed easing immigration restrictions and establishing a free trade zone throughout the hemisphere. His first two foreign trips were to Mexico and Canada, emphasizing their importance. Four years later, both initiatives are unfulfilled, not even on the agenda as Bush meets Wednesday in Texas with Mexican President Vicente Fox (news - web sites) and Canadian Prime Minister Paul Martin. Instead, the North American leaders will sign a pact pledging to increase border security without hindering the flow of goods or the millions of people that cross the...