According to Kennedy, why must the United States join the space race? A. to teach others about the history of progress
B. to join one of history’s greatest adventures
C. to maintain its position as a superpower
D. to honor its history of independence

The answer is B and C

Explanation:

In his speach he says "It is one of the Greatest adventures of ALL time"

britian is way too advanced for me my good luck

a historian researching the immigration policies of the early 1900s would expect a source written today,rather than in 1910 to :

( a ) be more interested in objective data and statistics.