Unrestricted submarine warfare, which became prominent in World War I, meant that submarines could sink any time of vessel at any time without warning. Before this, they had to surface first and place crews on lifeboats.
Answer:
Explanation:The Monroe Doctrine was a U.S. foreign policy regarding domination of the Americas in 1823. It stated that further efforts by European nations to colonize land or interfere with states in North or South America would be viewed as acts of aggression, requiring U.S. intervention
The south was a democratic region.
The democratic party was started by Andrew Jackson. The southern region was made by ,more whites who who were eager to maintain racism , and white supremacy and the democratic party seemed to support these ideals albeit until the days of Harry Truman and Johnson.
