[x]

Lincoln would have initiated military action even if Sumter had not been bombarded.

Him and what army?

The country wouldn't have backed him if he tried to start a war after saying he wouldn't.

[ought-six]

“Him and what army?”

He would not have had any difficulty raising an army. Remember, back in those days an army of 75,000 troops was considered large. But what he was really banking on was the navy, and blockading the South (a blockade is an act of war).

[PeaRidge]

X, you might want to add this to your list of post checks.

https://www.grammarly.com/answers/questions/6200-pronoun-he-or-him/