10月24日，白宫23日发布公告说，美国总统特朗普当日签署文件，调整对加拿大商品加征关税适用范围，相关调整将从美东时间10月30日开始生效。根据白宫发布的信息，相关调整依据《斯穆特-霍利关税法》第338条款作出，胶合板、漂白纸、纸板、塑料箱盒等商品将不再被额外征收50%的从价关税，而阀门、地毯等商品将被加征50%的从价关税。
多家外媒分析，豁免加征关税的加拿大商品对美国缅因州至关重要，特朗普在国会中期选举压力下作出上述调整，旨在帮助共和党参议员苏珊·柯林斯在缅因州激烈的连任选战中争取支持。特朗普7月20日签署多个公告，依据《斯穆特-霍利关税法》第338条款对从加拿大进口的红酒、曲棍球棒和水泥等数百项特定商品加征50%关税。他9月8日签署文件，调整适用这项关税措施的加拿大商品范围。
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