Why is The US Building Aluminum Warships?

Ships were historically built from steel, so why did The US start building warships from aluminium?
Maybe it's because aluminium is #NotWhatYouThink!

Music:
Oceanic Adventure - Bonnie Grace
Clearer Views - From Now On
Urgent News - Wendel Scherer
Fire Storm 3 - Fredrik Ekstrom
Arizona - Brendon Moeller-01
Smart Cube - Jobii
Sidelined - Dip Diet
Evolutionary Plans - Farrell Wooten

Footage:
Department of Defense, Royal Navy, Austal, Charles Walker, MrRIDE82, National Archives
Note: "The appearance of U.S. Department of Defense (DoD) visual information does not imply or constitute DoD endorsement."

REFERENCES:
https://news.usni.org/2013/01/17/navy...
http://navalmarinearchive.com/researc...
https://www.hazegray.org/faq/smn6.htm#F7
https://apnews.com/article/fb3c5f5bb2...
https://www.govinfo.gov/content/pkg/C...
http://www.shipmodels.info/mws_forum/...
https://www.smh.com.au/business/rust-...
http://www.fi-aeroweb.com/Defense/Lit...
https://www.magoda.com/construction/w...
https://apnews.com/article/c10693f883...
https://www.austal.com/sites/default/...
https://www.rbth.com/articles/2012/10...
https://www.dailypress.com/news/dp-xp...
https://www.navyrecognition.com/index...
https://www.offshore-energy.biz/new-i...