[Answer] Launched in 1958, what was the name of the United States' first satellite?

Step 1 : Introduction to the question "Launched in 1958, what was the name of the United States' first satellite?"

...1. Explorer 1
2. Vanguard 1
3. San Marco 1
4. Apollo 1

Step 2 : Answer to the question "Launched in 1958, what was the name of the United States' first satellite?"

Explorer 1:

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