As usual, nurse has trouble getting to the point. what does juliet think happened before she learns the truth?

she thinks romeo killed himself.
she thinks tybalt killed romeo.
she thinks romeo killed tybalt.
she thinks both romeo and tybalt killed each other.

She thinks both Romeo and Tybalt killed each other

Explanation:

Juliet would obviously be confused since the Nurse can't really be clear:

O Tybalt, Tybalt, the best friend I had!  

O courteous Tybalt! honest gentleman!  

That ever I should live to see thee dead! 1785

Juliet responds:

What storm is this that blows so contrary?  

Is Romeo slaughter'd, and is Tybalt dead?  

My dear-loved cousin, and my dearer lord?  

Then, dreadful trumpet, sound the general doom!  

For who is living, if those two are gone?

She seems to think that they both died fighting each other

the answer is a glaciers carved a large valley that later flooded and became puget sound

there are a number of different ideologies that come into conflict with regard to immigrants and immigration to the us.