英语语法分析

This vision of the founders served as a basis for asserting that freedom was a national moral imperative, and that the United States Constitution was an antislavery document.

国父们的这种远见成为了主张自由是国家道德义务的基础，美国宪法是一份反奴隶制的文件。

In this view, it was the castigation by Southerners that gradually caused widespread antislavery feeling throughout the North.

在这种观点下，正是南方人的谴责逐渐在北方引起了广泛的反奴隶制情绪。

This interpretive framework, which once dominated antislavery historiography, had been discounted by historians for two basic reasons.

这种解释框架曾主导过反奴隶制的史学，但由于两个基本原因，它已被历史学家所忽视。