Answer:
by strengthening the shield of the United Nations by encouraging uprisings against cruel leaders.
Explanation:
In the paragraph eleven, Kennedy proposed to make the world a better place in his speech by strengthening the shield of the United Nations by encouraging uprisings against cruel leaders.
Kennedy felt that the United Nation could be a powerful body of organisation if every country pledge to support it with commitment. Only through the United Nation, he believed that the world would be peaceful and its writs and channel should reach every country in the world.
Answer: So, your main idea or thesis here that you are talking about in this paragraph would be your goal to acheive things out of your own comfort zone.
However, more specifically you could make your thesis on either your desire to make new friendships or relationships / or you could make your thesis be about your desire to experience new situations that are out of your comfort zone..
Hope this helps some!