Which technological advancement was developed in installations near these cities during World War 2?

Atomic Bombs

Explanation:

Those cities were the place where the  American Government conducted the Manhattan Project.

That project cost the government around $ 2 Billion with the purpose of creating mass destroying weapons that can turn the tide of war in one's favor. Eventually, it led to the creation of Atomic Bombs.

In the world war 2, US military dropped 2 of those atomic bombs, on the City of Hiroshima and Nagasaki  In Japan. Killing around  146,000 people in Hiroshima and 80,000 people in Nagasaki.

This left the Japanese Government with no choice but to surrender, and make United States and its allies as the winner of world war 2.

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