1. lincoln was able to speak on both sides of the slavery debate. why did he feel compelled to do this, given his personal solution to the problem of slavery in america?

This is a long shot, since it was not provided any context for this question.

Abrahan Lincoln was in hiatus of his political career until the Kansas–Nebraska Act, in 1854. The act was responsible to create the territory of Nebraska and Kansas.

Lincoln saw potential for the slavery agenda in Congress after this act. He said in interviews that even thought he condenmed slavery, he believed that it was not fair or right for one free state to invade or try to block slavery in a slave state.

Therefore, it is believed that Lincoln could understand the constitutional problems for the slaveholders in case of abolition, that were mostly about the constitutional definition of property even though it was against his personals beliefs. With Lincoln being a lawyer, this point of view it's understanble.

I hope this is enough to help you.

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the answer that best explains what happened to george washington at fort necessity, pennsylvania is : washington was attacked by the french but was able to negotiate with them to peacefully end fighting. the battle took place on july 3, 1754. the battle is considered as being the start of the french and indian war.