Europe
I'm assuming that you are talking about colonization. Europe, specifically countries like England, France, Spain, and Portugal, held colonies across the world. I am not sure what time period specifically, but those countries, along with some others, held colonies in the Americas, South Asia, and South-East Asia.
Well the U.S broke all diplomatic relations with Vietnam and have slowly restored ties. So your answer should be true if so.
Answer:
Roosevelt resume relations with Japan to prevent America out of the future wars and more is discussed below in details.
Explanation:
To keep America out of future wars, congress passed a sequence of laws and Acts beginning in 1935 with the Neutrality Acts.
These acts banned firearms trades or loans to nations at war or in a civil war.
Roosevelt does not want Europeans to control the world economy and politics.
Roosevelt negotiates the Treaty of Portsmouth: In which Japan gets Manchuria and Korea, United States and Japan continued diplomatic talks and pledge to respect each other's possessions.
There was more than one technology that was developed at the time, but one technolgoy that surely made a strong impact and also enabled Europe becoming the dominant military force was the invention and perfection of military tactics together with muskets and cannons. This made them practically unstopable against any native population around the world.