This quote comes from the now famous Four Freedoms speech, delivered by Roosevelt as the State of the Union address on January 6, 1941. The international context was very negative. Hitler and his Axis allies were winning in Europe. Britain was greatly menaced and the Japanese were gearing up for all-out war in the Pacific and in Asia.
Roosevelt, aware that scientific progress had eliminated the physical advantage of the USA being separated from Europe and Asia by such vast expanses of water had been arming and funding the British for years and had also increased military spending and the Navy in order to keep Japan at bay.
He knew that once Hitler had conquered Europe and Japan had conquered the East, all the populations and resources of these vast reasons would be used to directly attack the USA, which would eventually find itself in numeric inferiority so in order to prevent such a dark future he chose to send weapons, supplies and money to the British.
Answer:
The Louisiana purchase
Explanation:
with more land, slaves and travelers settled in
The north had so many manufacturing plants that's what the north depended on the south depended on cotton and slavery
To prevent international tensions from leading to war
