He was impeached because adopting 11 articles of impeachment detailing his "high crimes and misdrmanors", in accordance with article two of the United States Constitution
The Columbian Exchange had positive and negative consequences.
Some of the positive consequences were the introduction of different nutrients and food supplies into the Old World, such as corn or potatoes. This improved the diet of most Europeans, leading to a population growth in the next generations.
However, Europe benefited more than the Americas, for some of the negative consequences about the Columbian Exchange were the introduction of diseases into the continent and the slavery of African populations into the Americas.
Paris peace conference
treaty of versailles
league of nations
german reparations
ww1 ended but international relations badly damaged
The answer is D. President Mckinley's desire for war