Because you are still listing events that happened.
Answer:
The space race between two Cold War rivals (The United States and The Soviet Union) could answer your 3 questions.
Explanation:
1. These first US Astronauts were seen as heroes during the Cold War rivalry who could meet the advances of the Soviet Union as it was a huge step for mankind.
2. In order to help generate the enthusiasm among the public, the government allowed Shepard's first flight broadcast.
3. Yes, Landing a person on the moon was worthwhile as it united people and established a new step for mankind.
Answer:
Family Vacation because it is talking about immigration and not having a vacation to the United States.
The purpose of the 1903 construction project is to protect from flooding by hurricanes