突然！特朗普，发出威胁！至少给一半，否则......

Core Viewpoint - The article discusses President Trump's recent threats to Canada regarding the Gordie Howe International Bridge, emphasizing his demands for compensation and ownership rights over the bridge, which is part of ongoing trade tensions between the two countries [1][2]. Group 1: Trump's Threats and Demands - Trump threatened to block the opening of the $4.6 billion Gordie Howe International Bridge unless the U.S. receives "adequate compensation" and claims that the U.S. should own at least half of the asset [2][3]. - He expressed dissatisfaction with Canada's ownership of the bridge, high tariffs on U.S. dairy products, and restrictions on the sale of certain U.S. alcoholic beverages [2][3]. Group 2: Economic Impact and Trade Relations - The bridge is expected to alleviate traffic pressure on the Ambassador Bridge, handling $126 billion in trade annually through commercial trucks [3]. - A study from the University of Windsor indicates that the bridge will reduce crossing times by 20 minutes and save truck drivers $2.3 billion over 30 years [3]. Group 3: Broader Context of U.S.-Canada Relations - Tensions between the U.S. and Canada have escalated, with Trump previously threatening to impose a 50% tariff on Canadian aircraft due to certification disputes [4][5]. - Canadian Prime Minister Carney has publicly defended Canada's sovereignty and criticized U.S. policies, asserting that Canada does not rely on the U.S. for its existence [6][7].