The information found by Lewis and Clark showed many new places to settle, what the new land was like, and what could be accomplished in those areas. They found more land to farm and build homes. They also found some of the major rivers and landmarks of today.
Spain closed the lower Mississippi River to American trade because if American relations with Great Britain were poor, affairs with Spain were worse. Spain, which held Florida as well as lands west of the Mississippi River, was anxious to halt American expansion into the territory it claimed. As a result, Spain closed the lower Mississippi River to American shipping in 1784.
The first World War ended with the Treaty of Versailles, which ruined all of what Germany had gained from the war. Included was that Germany couldn't have an army of any great size nor power, large portions of the territory gained was taken, it forced Germany to pay for the damages which were caused, and to admit that the war itself was Germany's fault. Each part of this Treaty angered Germany. So when the Nazi's became popular, it appeared that the Nazi's (who were fascist) might be able to abrogate the treaty and Germany to what they thought was its rightful place as a major power, the Germans supported them.
