What was seward's argument and what did he accomplish?

In 1850 Seward made his “Higher Law” speech where he stated: " there is a Higher Law than the Constitution." This incendiary statement was to Seward's successful argument that California should be admitted into the Union as a free state. Due to Seward's compelling argument California entered as a free state.

Explanation:

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norsemen from northern countries had made earlier journeys