How did the Wilmot Proviso foreshadow future political issues?

The Wilmot Proviso proposed banning slavery in territory acquired from Mexico. Although it did not become law, the heated disagreement over it revealed growing conflict between North and South about whether slavery could expand into new territories. This foreshadowed future political battles over the expansion of slavery, so the correct choice is “It pointed to trouble ahead in the debate over the expansion of slavery.”

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