No, the US has never won the Rugby World Cup.
No they have not yet won the world cup.
No the U.S.A have never won the world cup so far.
United States have never won the world cup.
The U.S.A have never won the world cup, ever.
The U.S.A have never ever won the men's world cup. But they hosted it in 1994.
Yes, in 1994. Brazil won.
Yes the U.S.A have won the ladies world cup twice , once in 1991 and in 1999.
No, they have not won the world cup. Their best ever finish was in the inaugural 1930 tournament when they made it to the semi-finals.