What impact did the purchase of Alaska have on U.S. territory?

The purchase of Alaska in 1867 significantly increased access to natural resources for the United States. Alaska is rich in a variety of natural resources, including oil, gas, minerals, and fisheries. Following the acquisition, U.S. interests in these resources expanded, ultimately leading to substantial economic benefits and development within the state.

Through this purchase, the U.S. gained vast territories that would later be crucial for the extraction and production of valuable resources, encouraging both national security and economic growth. The discovery of gold in the late 19th century and subsequent oil discoveries in the 20th century further underscored the importance of Alaska's resources to the U.S. economy and energy needs.

The other answer choices do not accurately represent the primary impact of the Alaska purchase. For instance, the purchase did not reduce the size of the U.S.; instead, it greatly increased it. While Alaska did later become a strategic location for military installations, particularly during the World Wars, the purchase itself was more about resources than establishing a naval base. Unlike colonies, which are typically territories under the political control of another country, Alaska was integrated into the U.S. and eventually became a state, emphasizing its importance as a part of the nation rather than a colonial possession