Which of the following methods of acquisition is incorrect? Hawaii-Annexation
Alaska- Purchase
Puerto Rico-War
Philippines -Annexation

Alaska- Purchase

Explanation:

Alaska was purchased in 1867, during the presidency of Andrew Johnson.

The Russian Empire, at the time ruled by czar Alexander II, was interested in selling the land because of three reasons:

Because of these three reasons, the purcahase was completed in a brief period of time, and the US Senate approved the deal by a wide margin.

the colonial period, since this was a time of mass immigration from a variety of people from europe.