As Communism<span> in the Soviet Union and </span>Eastern Europe <span>began to collapse due to the revolutions taking place, pressure mounted on the </span>East<span> German authorities to open the Berlin border to the west. Thousands of Germans were escaping to the west through Hungary and the GDR was powerless to stop them.</span>
C. was passed to keep America ethnically uniform.
A) A fort was established and many were killed by diseases
Lewis and Clark's expedition was not positive to the native of Mandan village the most devastating epidemic was the smallpox outbreak in the year 1837 killing a lot of people. The epidemic played an important factor in uniting the surviving Mandans and Hidatsa who later engaged in trade, farming and hunting.
