I think it's around the 1850s
The Louisiana Purchase treaty. the Louisiana Purchase treaty was an agreement between Thomas Jefferson and Napoleon Bonaparte in 1803 for the US to obtain the Louisiana territory (a large region from Louisiana to Montana) from the French for $15 million. This fits the concept of Manifest Destiny perfectly as Manifest Destiny was the US desire to expand westward across the North American territory. Purchasing the Louisiana territory allowed the US to expand westward and explore new territory while spreading American people and culture.
There were 20 disputed electoral votes from new states
