For Europe, settlement meant alleviating some of the financial and physical stress caused by overpopulation, as well as opening up new avenues for trade. For North America, it meant the systematic murder and eventual removal of Native Americans, as well as the eventual birth of America, the world's most powerful country.
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The plan was referred to as the final solution but Hitler's goal was extermination (A)
The US did complain, a lot. Mostly due to that fact that Western Berlin which was controlled By the USA, France and Britian was securely behind this barrier and so to supply half of an entire city they had to fly in 24/7 airlift cargo missions for weeks on end to keep the city from starving.
D.) The workers on the canal were attacked during a rebellion in Panama.