Answer:
a lack of immunity to certain diseases
Answer:
Isolationism was stronger after the depression
Explanation:
After WWI, USA became more active economically and military in aid for Europe's countries in post-war recovery. This meant that many European countries depended on US loans to recover. After the crash in 1929, USA became more conscious about their own economy and stopped participating in European conflicts. This encouraged countries such as Germany or Japan to take action in order to expand territory, which gave place to the raise of fascism in these countries (Japan's INnvasion of China in 1937 and Germany's annexation of Czechoslovakia in 1938, for example)
