prior to European colonization in Africa, slavery had already existed between the people there, slave owners would willingly offer their slaves to the Europeans in order to protect them selves, the europeans can argue that they did not establish slavery, rather, they continued work that seemed beneficial to them.
Ottoman empire and the british empire there more though
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George Washington was the first president of the United States of America.
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Yes, it is true that the Treaty of Versailles was violated by Hitler's military build-up, since the treaty expressly prohibited the German military from reaching this size. Many European powers "turned their heads" however, since they didn't want to engage in another conflict.