In the illinois senate race of 1858, an opponent of slavery would have been most likely to vote for ? ?

The Republican candidate Abraham Lincoln.

Explanation:

The Illinois Senate race of 1858 was between Stephen Arnold Douglas and Abraham Lincon. Slavery was the main reason for Lincoln and Douglas debates, particularly the issue of slavery's expansion into the territories. Both had different opinions concerning slavery as Lincoln supported the Wilmot Proviso which wanted to ban slavery in any new territory while Douglas wanted the slavery expansion into the territories.

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