How was the election of 1840 different from other elections?

The 1840 presidential election was the only U.S. Presidential election in which four people who either had been or would become a U.S. President (Van Buren, Harrison, Tyler, and Polk) received at least one vote in the Electoral College.

Explanation:

the right answer is the end of world war ii

after the end of a global wwii all the nations involved, in an attempt to create an organization to maintain world peace. this agreement would work settling international disputes via negotiation and arbitration instead of leading the issues escalate to another war.