In Independence Day 2: Resurgence:
For 20 years, an alien ship had landed on Earth, in Africa. For at least 10 years, the aliens had routinely skirmished with the local African warlord, General Umbutu, resulting in many human deaths, and a partial learning of the aliens' written language.
Why did the United Earth Alliance government not launch a concerted attack and capture the working alien tech at any point between July 5th, 1996, and July 4th, 2016?
As the Director of Earth Strategic Defense, Why was it Dr. Levinson's first time to visit the live and functional alien craft?
Is there any explanation for this?