特朗普：加拿大可免费用“金穹”，但有个条件

Core Viewpoint - The U.S. President Trump suggested that Canada would need to pay $61 billion to join the U.S. "Iron Dome" missile defense system, but if Canada were to become the 51st state of the U.S., it would incur no costs [1][3]. Group 1: U.S. "Iron Dome" Missile Defense System - The "Iron Dome" system is projected to cost approximately $175 billion, as announced by Trump [3]. - Canada is reportedly seeking to invest in the "Iron Dome" system [3]. Group 2: Canada’s Response - Canadian Prime Minister Mark Carney firmly stated that Canada will never become a part of the U.S., emphasizing that Canada is "not for sale" [4]. - Carney expressed concerns about U.S. intentions towards Canadian land and resources, asserting that such annexation will never happen [4]. Group 3: Challenges and Criticism of the "Iron Dome" System - The "Iron Dome" plan has faced widespread criticism for its aggressive nature and potential violation of international treaties, particularly the Outer Space Treaty [7]. - Key challenges for the "Iron Dome" system include cost, the need for a robust defense industrial base, and technological breakthroughs for its components [7]. - The feasibility of the "Iron Dome" system is contingent on the types and quantities of threats the U.S. faces, with higher standards leading to increased costs [7].