Answer:
The victory at the battle of Antietam gave Abraham Lincoln a platform to issue the Proclamation from a position of strength
Explanation:
This changed the character of the Civil War and prevented the European powers from intervening on behave of their trading partners of the southern Confederacy
On March third 1918, Lenin signed a peace treaty that withdrew Russia from WWI.
I don't know what "this" means here - but Spain, England and Portugal based their empires on their sea explorations and colonizations - all their colonies were not reachable (or only by de-tours) by land.
China, on the other hand was not based on Islands, but connected by land: so here China is the best option.
I think philosophy, science, and communication