1. In the following graph, there is a sudden dip in 2001. This is because of the attack on the twin towers on September 11, 2001. Statistics are greatly affected by what is happening historically. For example, the number of immigrant to a country may depend on whether or not the country is in civil war. If a country is in war immigration into the country is probably going to be low, but the surrounding countries will probably be high as people flee their own country for the safety of others. Another example is when a country is at war before and during the war factory and their emissions will increase because of the equipment needed for war, but after the war the emissions will go down. This is why statistics and history are interconnected.
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