Answer:
Used all four fields.
Step-by-step explanation:
The two superpowers uses a way of intimidating their opponents through the space race, arms race, economic race and a technological race. That country who is on the first number in these four fields is considered superpower and having edge on their opponents. The most important field is the economic race because the country having strong economy, so it has high purchasing power as well as more influence on other countries so that's why in this century, countries achieve good economy to counter its opponents.