Snow ,rock avalanches and frigid weather
I think the main issue was not to approve <span>Emancipation Proclamation, which made all the slaves in the south were free. I'm not sure about this answer </span>
The Treaty of Versailles helped pave the way for the Nazi party to gain control of Germany by creating resentment and anger among the German people. Many German people were very resentful of their government (the Weimar Government) for having signed the peace Treaty in June 1919, since the terms of the Treaty were indeed very harmful to Germany: it took territory from the country, it forced it to pay reparations, and (and this term really caused indignation about the Germans) it blamed it and her allies for having started the war.
Since the Weimar Government was not popular and the country was facing tremeduous economic and social problems, the Nazis were able to gain the support of the German people, and eventually had the control of Germany.
On May 31, 2009, a team of engineers at Woods Hole Oceanographic Institution (WHOI) celebrated as the unique vehicle called Nereus<span> dove to 10,902 meters (6.8 miles) in the western Pacific Ocean’s Mariana Trench.</span>
A) It became the first remote operated deep-sea robot
Hope it helps