Depends on how you look at it.. They were desperate and had to stop the British from gaining support. But it wasn't confirmed that It was carrying weapons, there were civilians on it so theres good reasoning why they sunk it. The Germans did not let civilian casualties get in their way really as seen with their bombing of cities and use of chemical warfare.
The republican party was first led by Abraham Lincoln and was focused on abolishing slavery.
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The debate of slavery divided the country because of this lead to the civil war. The south was built on the principles of slavery, needing them to work and serve on plantations. The north was built on opportunities and chances relying on urbanisation. When Abraham Lincoln became president he set off to free the slaves " Being free is a human right" this angered many southerners who believed that slaves were less then humans. The south seceded the north because of this which sparked the civil war.
It was a time between the USSR and the United states in which they were on the brink of nuclear war. Some affect of this were advances in computer technology and other things. It caused propaganda from each side saying how the 'Red scare' were ruthless killers.
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The colonies of the American South wanted to copy the class system of England for the way of life and the goal of planters in the South was to have an aristocratic society like the one in England.