The purchase of Alaska added 586,412 square miles to the U.S.
Answer:
Doubled the size
Explanation:
The Louisiana Purchase happened in 1803 and added 828 square miles to the US territory, doubling the size of the country. The US paid U$ 11,250,000 to France for the territory and soon after, the expansion westward started.
i think its a)human capital i might be wrong tho