QUICK The Ohio River has had the most impact on the nation's history.

It wasn't the biggest but i'd say it was close. The Ohio River was the cause of the 7 years war which is also called The French & Indian War which was a huge war between France, The colonists, and the British Crown. The reason it was called the French & Indian war is because the Indians helped the French fight. I believe British won that war.

Explanation:

a peace conference held after the surrender of japan

an international conference held near the end of world war ii

a meeting of the victorious nations after the defeat of germany

a summit meeting between the united states and the soviet union