Oh I know this one! It's Roger Sherman.
The TET offensive
The offensive started in Vietnam new lunar year, known as lunar holiday. The north Vietnamese communist regime and the Vietcong, the rebel group that was fighting against the south Vietnam regime launched a series of attacks. the USA joined the war with an aim of containing the spread of communism as the North wanted to reunite with the south.
Technological progress, economic advancement, and military strength
Cotton gins, battery, cars, radio