contestada

Which of these is an example of economic transformation that occurred in the early 20th century?
A) The United States helped negotiate a peace agreement between Japan and Russia.
B) The United States increased its size drastically by purchasing the territory of Alaska from Russia.
C) President Lyndon B. Johnson supported a “flexible defense” strategy in response to perceived communist threats.
D) President Taft instituted the practice of “dollar diplomacy” through financial interventions in Central America.