explain the problem the us space program had during the 1950s and 1960s until we landed on the moon in 1969

The United States and the Soviet Union were undeniably the world's primary superpowers at the end of World War II. They competed against one other in a variety of ways in addition to the Cold War.

Explanation: The Space Race was a race between the United States and the Soviet Union to explore space with satellites and manned spacecraft. It was also a competition to determine which superpower would be the first to reach the moon.

hope this helps mate good luck! :)

we need an attachment to see what you are talking about.

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."