Why does the US rely on Saudi Arabia to contain Iran?

Trump has sold arms to Saudi Arabia citing the threat posed by Iran. But why does the USA need to rely on a country that provided 15 of the 19 9-11 hijackers? Can't America deal with Iran by itself? What do these Saudis do with these arms they hoard as they have not attacked Iran ever as they are too scared... show more Trump has sold arms to Saudi Arabia citing the threat posed by Iran.

But why does the USA need to rely on a country that provided 15 of the 19 9-11 hijackers?

Can't America deal with Iran by itself? What do these Saudis do with these arms they hoard as they have not attacked Iran ever as they are too scared or unwilling.

https://www.bbc.co.uk/news/world-us-canada-48404923
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