The answer is: The Law of Land Warfare, Uniform Code of Military Justice, and Code of Conduct.
The answer may vary from country to country but on an international level the United Nations Charter also provides code of conducts on how modern armies should function in times of war.
These are important in order to provide a moral structure to an Army which can become, as evidenced in history, quite ruthless.
One form of resistance was slowing down the picking of cotton. Slaves would intentionally go slower so that they could have an easier time in the fields. This was combatted by the Southern Plantation owners after a while by whipping the slaves severely during their first picks and then mandating that they had to pick at least as much cotton every time after.
Another form of resistance was to run away. The Underground Railroad helped thousands of slaves escape to the north and to freedom.
Wildly enough, may look back at the Cold War with fondness as it represented a time when the US knew who its enemies were. This is contrast to the state of warfare today where the US is fighting terrorist groups around the world.
Answer:
Below 20 degrees North latitude means less than 20 degrees North. Which of the options has a number less than 20 degrees north?
13 degrees North, 47 degrees east. 47 is also *slightly* east of 45, unlike all the other options.
Explanation: