1942年初，中、美、英、苏等26国代表齐聚华盛顿，共同签署了《联合国家宣言》，至此，世界反法西斯同盟正式形成。
据此回答：
（1）世界反法西斯同盟是怎样形成的？
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（2）世界反法西斯同盟建立的意义是什么？
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